Append string on redirect
When redirecting all output to stderr
stat file >&2
If the command throws an error (e.g. file does not exist) how can one prepend some arbitraty text e.g.
<<MY ARBITRARY TEXT>>: stat: cannot stat 'file': No such file or directory
The required logic is:
let res = stat file
if error then output "<<MY ARBITRARY TEXT>>"+error to stderr
else output res to stderr
More context: all command output is being redirected to stderr because stdout and stderr streams do always return in the right order, i.e. if multiple commands are sent and one throw an error, the stdout of the next command may return before the stderr of the original command. To avoid this I am merging all commands onto stderr, but ideally would like to be able to easily identify errors.
bash shell-script shell
asked 23 mins ago
TrevTheDevTrevTheDev
1134
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When redirecting all output to stderr
stat file >&2
If the command throws an error (e.g. file does not exist) how can one prepend some arbitraty text e.g.
<<MY ARBITRARY TEXT>>: stat: cannot stat 'file': No such file or directory
The required logic is:
let res = stat file
if error then output "<<MY ARBITRARY TEXT>>"+error to stderr
else output res to stderr
More context: all command output is being redirected to stderr because stdout and stderr streams do always return in the right order, i.e. if multiple commands are sent and one throw an error, the stdout of the next command may return before the stderr of the original command. To avoid this I am merging all commands onto stderr, but ideally would like to be able to easily identify errors.
bash shell-script shell
asked 23 mins ago
TrevTheDevTrevTheDev
1134
New contributor
TrevTheDev 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 |
When redirecting all output to stderr
stat file >&2
If the command throws an error (e.g. file does not exist) how can one prepend some arbitraty text e.g.
<<MY ARBITRARY TEXT>>: stat: cannot stat 'file': No such file or directory
The required logic is:
let res = stat file
if error then output "<<MY ARBITRARY TEXT>>"+error to stderr
else output res to stderr
More context: all command output is being redirected to stderr because stdout and stderr streams do always return in the right order, i.e. if multiple commands are sent and one throw an error, the stdout of the next command may return before the stderr of the original command. To avoid this I am merging all commands onto stderr, but ideally would like to be able to easily identify errors.
bash shell-script shell
asked 23 mins ago
TrevTheDevTrevTheDev
1134
New contributor
TrevTheDev is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
When redirecting all output to stderr
stat file >&2
If the command throws an error (e.g. file does not exist) how can one prepend some arbitraty text e.g.
<<MY ARBITRARY TEXT>>: stat: cannot stat 'file': No such file or directory
The required logic is:
let res = stat file
if error then output "<<MY ARBITRARY TEXT>>"+error to stderr
else output res to stderr
More context: all command output is being redirected to stderr because stdout and stderr streams do always return in the right order, i.e. if multiple commands are sent and one throw an error, the stdout of the next command may return before the stderr of the original command. To avoid this I am merging all commands onto stderr, but ideally would like to be able to easily identify errors.
bash shell-script shell
bash shell-script shell
asked 23 mins ago
TrevTheDevTrevTheDev
1134
New contributor
TrevTheDev is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 23 mins ago
TrevTheDevTrevTheDev
1134
New contributor
TrevTheDev is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 23 mins ago
TrevTheDevTrevTheDev
1134
New contributor
TrevTheDev is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 23 mins ago
TrevTheDevTrevTheDev
1134
asked 23 mins ago
TrevTheDevTrevTheDev
1134
1134
New contributor
TrevTheDev is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
TrevTheDev is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
TrevTheDev 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 |
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