Shell script-How to return maximum value in array?
I have a array:
ARRAY=(12.5 6.2)
I wish to return the maximum value in ARRAY which Output is 12.5
Anyone can share me ideas?
I have try this:
max=0
for v in ${ARRAY[@]}; do
if (( $v > $max )); then max=$v; fi;
done
echo $max
But it return me:
((: 12.5 > 0 : syntax error: invalid arithmetic operator (error token is ".5 > 0 ")
((: 6.2 > 0 : syntax error: invalid arithmetic operator (error token is ".2 > 0 ")
shell-script array bash-array
asked 14 hours ago
Shi Jie TioShi Jie Tio
1343
New contributor
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a array:
ARRAY=(12.5 6.2)
I wish to return the maximum value in ARRAY which Output is 12.5
Anyone can share me ideas?
I have try this:
max=0
for v in ${ARRAY[@]}; do
if (( $v > $max )); then max=$v; fi;
done
echo $max
But it return me:
((: 12.5 > 0 : syntax error: invalid arithmetic operator (error token is ".5 > 0 ")
((: 6.2 > 0 : syntax error: invalid arithmetic operator (error token is ".2 > 0 ")
shell-script array bash-array
asked 14 hours ago
Shi Jie TioShi Jie Tio
1343
New contributor
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a array:
ARRAY=(12.5 6.2)
I wish to return the maximum value in ARRAY which Output is 12.5
Anyone can share me ideas?
I have try this:
max=0
for v in ${ARRAY[@]}; do
if (( $v > $max )); then max=$v; fi;
done
echo $max
But it return me:
((: 12.5 > 0 : syntax error: invalid arithmetic operator (error token is ".5 > 0 ")
((: 6.2 > 0 : syntax error: invalid arithmetic operator (error token is ".2 > 0 ")
shell-script array bash-array
asked 14 hours ago
Shi Jie TioShi Jie Tio
1343
New contributor
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a array:
ARRAY=(12.5 6.2)
I wish to return the maximum value in ARRAY which Output is 12.5
Anyone can share me ideas?
I have try this:
max=0
for v in ${ARRAY[@]}; do
if (( $v > $max )); then max=$v; fi;
done
echo $max
But it return me:
((: 12.5 > 0 : syntax error: invalid arithmetic operator (error token is ".5 > 0 ")
((: 6.2 > 0 : syntax error: invalid arithmetic operator (error token is ".2 > 0 ")
shell-script array bash-array
shell-script array bash-array
asked 14 hours ago
Shi Jie TioShi Jie Tio
1343
New contributor
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 14 hours ago
Shi Jie TioShi Jie Tio
1343
New contributor
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 14 hours ago
Shi Jie TioShi Jie Tio
1343
New contributor
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 14 hours ago
Shi Jie TioShi Jie Tio
1343
asked 14 hours ago
Shi Jie TioShi Jie Tio
1343
1343
New contributor
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Shi Jie Tio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
printf '%sn' "${ARRAY[@]}" |
awk '$1 > m || NR == 1 { m = $1 } END { print m }'
Since the bash shell does not do floating point arithmetics, it's easier to compare floating point numbers in another language. Here I'm using awk to find the maximum of all the elements in the ARRAY array.
The printf command will output each element of the array on its own line and the awk code will update its m value to be the maximum of the values seen so far. At the end, the m value is printed.
The test on NR == 1 will be true on for the first line read by the awk program and would initialise the value of m to the first value of the array (something that you fail to do, which means that your code would have returned 0 for an array with all negative numbers, had it worked).
answered 14 hours ago
KusalanandaKusalananda
124k16234386
Possible alternative to|| NR == 1: setmto array's first element using-v m="${ARRAY}"
– Olorin
14 hours ago
Can your function here store in a variable?
– Shi Jie Tio
14 hours ago
@ShiJieTio I'm using no function, but the result may be stored in a variable using a standard command substitution as usual:max=$( printf ... | awk ... ).
– Kusalananda
14 hours ago
for example: Result= "%sn' "${ARRAY[@]}" |awk '$1 > m || m == "" { m = $1 } END { print m }"
– Shi Jie Tio
13 hours ago
@ShiJieTio No. You left out theprintfand the$( ... )bit.
– Kusalananda
13 hours ago
add a comment |
If you want to do floating point arithmetics, you'd need to switch to ksh93, zsh or yash (or fish if you're ready to wander away from Bourne-like shells), bash doesn't support them.
For a syntax compatible to all 3 shells:
max() {
[ "$#" -gt 0 ] || return
typeset i max="$1"; shift
for i do
if [ "$((i > max))" -ne 0 ]; then
max=$i
fi
done
printf '%sn' "$max"
}
array=(12.5 6.2 nan 0xfff -inf inf -1e12 1e20)
max "${array[@]}"
(you need a recent version of zsh for inf/nan to be supported. Variations in case are supported in all 3 (INF, NaN, Inf...), but only yash supports alternative spellings like Infinity; 0x12p34 types of numbers are not supported by zsh yet. Beware that whether 010 means 10 or 8 depends on the shell and its configuration)
answered 13 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Shi Jie Tio is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f494977%2fshell-script-how-to-return-maximum-value-in-array%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
printf '%sn' "${ARRAY[@]}" |
awk '$1 > m || NR == 1 { m = $1 } END { print m }'
Since the bash shell does not do floating point arithmetics, it's easier to compare floating point numbers in another language. Here I'm using awk to find the maximum of all the elements in the ARRAY array.
The printf command will output each element of the array on its own line and the awk code will update its m value to be the maximum of the values seen so far. At the end, the m value is printed.
The test on NR == 1 will be true on for the first line read by the awk program and would initialise the value of m to the first value of the array (something that you fail to do, which means that your code would have returned 0 for an array with all negative numbers, had it worked).
answered 14 hours ago
KusalanandaKusalananda
124k16234386
Possible alternative to|| NR == 1: setmto array's first element using-v m="${ARRAY}"
– Olorin
14 hours ago
Can your function here store in a variable?
– Shi Jie Tio
14 hours ago
@ShiJieTio I'm using no function, but the result may be stored in a variable using a standard command substitution as usual:max=$( printf ... | awk ... ).
– Kusalananda
14 hours ago
for example: Result= "%sn' "${ARRAY[@]}" |awk '$1 > m || m == "" { m = $1 } END { print m }"
– Shi Jie Tio
13 hours ago
@ShiJieTio No. You left out theprintfand the$( ... )bit.
– Kusalananda
13 hours ago
add a comment |
printf '%sn' "${ARRAY[@]}" |
awk '$1 > m || NR == 1 { m = $1 } END { print m }'
Since the bash shell does not do floating point arithmetics, it's easier to compare floating point numbers in another language. Here I'm using awk to find the maximum of all the elements in the ARRAY array.
The printf command will output each element of the array on its own line and the awk code will update its m value to be the maximum of the values seen so far. At the end, the m value is printed.
The test on NR == 1 will be true on for the first line read by the awk program and would initialise the value of m to the first value of the array (something that you fail to do, which means that your code would have returned 0 for an array with all negative numbers, had it worked).
answered 14 hours ago
KusalanandaKusalananda
124k16234386
Possible alternative to|| NR == 1: setmto array's first element using-v m="${ARRAY}"
– Olorin
14 hours ago
Can your function here store in a variable?
– Shi Jie Tio
14 hours ago
@ShiJieTio I'm using no function, but the result may be stored in a variable using a standard command substitution as usual:max=$( printf ... | awk ... ).
– Kusalananda
14 hours ago
for example: Result= "%sn' "${ARRAY[@]}" |awk '$1 > m || m == "" { m = $1 } END { print m }"
– Shi Jie Tio
13 hours ago
@ShiJieTio No. You left out theprintfand the$( ... )bit.
– Kusalananda
13 hours ago
add a comment |
printf '%sn' "${ARRAY[@]}" |
awk '$1 > m || NR == 1 { m = $1 } END { print m }'
Since the bash shell does not do floating point arithmetics, it's easier to compare floating point numbers in another language. Here I'm using awk to find the maximum of all the elements in the ARRAY array.
The printf command will output each element of the array on its own line and the awk code will update its m value to be the maximum of the values seen so far. At the end, the m value is printed.
The test on NR == 1 will be true on for the first line read by the awk program and would initialise the value of m to the first value of the array (something that you fail to do, which means that your code would have returned 0 for an array with all negative numbers, had it worked).
answered 14 hours ago
KusalanandaKusalananda
124k16234386
printf '%sn' "${ARRAY[@]}" |
awk '$1 > m || NR == 1 { m = $1 } END { print m }'
Since the bash shell does not do floating point arithmetics, it's easier to compare floating point numbers in another language. Here I'm using awk to find the maximum of all the elements in the ARRAY array.
The printf command will output each element of the array on its own line and the awk code will update its m value to be the maximum of the values seen so far. At the end, the m value is printed.
The test on NR == 1 will be true on for the first line read by the awk program and would initialise the value of m to the first value of the array (something that you fail to do, which means that your code would have returned 0 for an array with all negative numbers, had it worked).
answered 14 hours ago
KusalanandaKusalananda
124k16234386
edited 13 hours ago
answered 14 hours ago
KusalanandaKusalananda
124k16234386
answered 14 hours ago
KusalanandaKusalananda
124k16234386
answered 14 hours ago
KusalanandaKusalananda
124k16234386
124k16234386
Possible alternative to|| NR == 1: setmto array's first element using-v m="${ARRAY}"
– Olorin
14 hours ago
Can your function here store in a variable?
– Shi Jie Tio
14 hours ago
@ShiJieTio I'm using no function, but the result may be stored in a variable using a standard command substitution as usual:max=$( printf ... | awk ... ).
– Kusalananda
14 hours ago
for example: Result= "%sn' "${ARRAY[@]}" |awk '$1 > m || m == "" { m = $1 } END { print m }"
– Shi Jie Tio
13 hours ago
@ShiJieTio No. You left out theprintfand the$( ... )bit.
– Kusalananda
13 hours ago
add a comment |
Possible alternative to|| NR == 1: setmto array's first element using-v m="${ARRAY}"
– Olorin
14 hours ago
Can your function here store in a variable?
– Shi Jie Tio
14 hours ago
@ShiJieTio I'm using no function, but the result may be stored in a variable using a standard command substitution as usual:max=$( printf ... | awk ... ).
– Kusalananda
14 hours ago
for example: Result= "%sn' "${ARRAY[@]}" |awk '$1 > m || m == "" { m = $1 } END { print m }"
– Shi Jie Tio
13 hours ago
@ShiJieTio No. You left out theprintfand the$( ... )bit.
– Kusalananda
13 hours ago
Possible alternative to
|| NR == 1: set m to array's first element using -v m="${ARRAY}"– Olorin
14 hours ago
Possible alternative to
|| NR == 1: set m to array's first element using -v m="${ARRAY}"– Olorin
14 hours ago
Can your function here store in a variable?
– Shi Jie Tio
14 hours ago
Can your function here store in a variable?
– Shi Jie Tio
14 hours ago
@ShiJieTio I'm using no function, but the result may be stored in a variable using a standard command substitution as usual:
max=$( printf ... | awk ... ).– Kusalananda
14 hours ago
@ShiJieTio I'm using no function, but the result may be stored in a variable using a standard command substitution as usual:
max=$( printf ... | awk ... ).– Kusalananda
14 hours ago
for example: Result= "%sn' "${ARRAY[@]}" |awk '$1 > m || m == "" { m = $1 } END { print m }"
– Shi Jie Tio
13 hours ago
for example: Result= "%sn' "${ARRAY[@]}" |awk '$1 > m || m == "" { m = $1 } END { print m }"
– Shi Jie Tio
13 hours ago
@ShiJieTio No. You left out the
printf and the $( ... ) bit.– Kusalananda
13 hours ago
@ShiJieTio No. You left out the
printf and the $( ... ) bit.– Kusalananda
13 hours ago
add a comment |
If you want to do floating point arithmetics, you'd need to switch to ksh93, zsh or yash (or fish if you're ready to wander away from Bourne-like shells), bash doesn't support them.
For a syntax compatible to all 3 shells:
max() {
[ "$#" -gt 0 ] || return
typeset i max="$1"; shift
for i do
if [ "$((i > max))" -ne 0 ]; then
max=$i
fi
done
printf '%sn' "$max"
}
array=(12.5 6.2 nan 0xfff -inf inf -1e12 1e20)
max "${array[@]}"
(you need a recent version of zsh for inf/nan to be supported. Variations in case are supported in all 3 (INF, NaN, Inf...), but only yash supports alternative spellings like Infinity; 0x12p34 types of numbers are not supported by zsh yet. Beware that whether 010 means 10 or 8 depends on the shell and its configuration)
answered 13 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
add a comment |
If you want to do floating point arithmetics, you'd need to switch to ksh93, zsh or yash (or fish if you're ready to wander away from Bourne-like shells), bash doesn't support them.
For a syntax compatible to all 3 shells:
max() {
[ "$#" -gt 0 ] || return
typeset i max="$1"; shift
for i do
if [ "$((i > max))" -ne 0 ]; then
max=$i
fi
done
printf '%sn' "$max"
}
array=(12.5 6.2 nan 0xfff -inf inf -1e12 1e20)
max "${array[@]}"
(you need a recent version of zsh for inf/nan to be supported. Variations in case are supported in all 3 (INF, NaN, Inf...), but only yash supports alternative spellings like Infinity; 0x12p34 types of numbers are not supported by zsh yet. Beware that whether 010 means 10 or 8 depends on the shell and its configuration)
answered 13 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
add a comment |
If you want to do floating point arithmetics, you'd need to switch to ksh93, zsh or yash (or fish if you're ready to wander away from Bourne-like shells), bash doesn't support them.
For a syntax compatible to all 3 shells:
max() {
[ "$#" -gt 0 ] || return
typeset i max="$1"; shift
for i do
if [ "$((i > max))" -ne 0 ]; then
max=$i
fi
done
printf '%sn' "$max"
}
array=(12.5 6.2 nan 0xfff -inf inf -1e12 1e20)
max "${array[@]}"
(you need a recent version of zsh for inf/nan to be supported. Variations in case are supported in all 3 (INF, NaN, Inf...), but only yash supports alternative spellings like Infinity; 0x12p34 types of numbers are not supported by zsh yet. Beware that whether 010 means 10 or 8 depends on the shell and its configuration)
answered 13 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
If you want to do floating point arithmetics, you'd need to switch to ksh93, zsh or yash (or fish if you're ready to wander away from Bourne-like shells), bash doesn't support them.
For a syntax compatible to all 3 shells:
max() {
[ "$#" -gt 0 ] || return
typeset i max="$1"; shift
for i do
if [ "$((i > max))" -ne 0 ]; then
max=$i
fi
done
printf '%sn' "$max"
}
array=(12.5 6.2 nan 0xfff -inf inf -1e12 1e20)
max "${array[@]}"
(you need a recent version of zsh for inf/nan to be supported. Variations in case are supported in all 3 (INF, NaN, Inf...), but only yash supports alternative spellings like Infinity; 0x12p34 types of numbers are not supported by zsh yet. Beware that whether 010 means 10 or 8 depends on the shell and its configuration)
answered 13 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
answered 13 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
answered 13 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
answered 13 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
301k55564916
add a comment |
add a comment |
Shi Jie Tio is a new contributor. Be nice, and check out our Code of Conduct.
Shi Jie Tio is a new contributor. Be nice, and check out our Code of Conduct.
Shi Jie Tio is a new contributor. Be nice, and check out our Code of Conduct.
Shi Jie Tio is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f494977%2fshell-script-how-to-return-maximum-value-in-array%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
