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May 19, 2015 - A Look At The New Commandlinefu
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stderr in color

Terminal - stderr in color
mycommand 2> >(while read line; do echo -e "\e[01;31m$line\e[0m"; done)
2010-12-30 21:42:42
User: confiq
Functions: echo read
stderr in color

in case you run some command in CLI and would like to take read strerr little bit better, you can use the following command. It's also possible to grep it if necessary....


There are 2 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

Can this be applied to the shell as well so that you set it once and it works for all subsequent commands?

Comment by stbu 265 weeks and 6 days ago

This can be made into a function like so:

function red_error { "$@" 2> >(while read line; do echo -e "\e[01;31m$line\e[0m"; done) }

Then for example:

red_error tar tvf some_file.tgz
Comment by dstahlke 265 weeks and 1 day ago

Enter the function and the following into your .bashrc.

bind 'RETURN: "\e[1~error \e[4~\n"'

See http://superuser.com/questions/117227/a-command-before-every-bash-command for more info

Comment by capncanuck 265 weeks and 1 day ago

replace 'error' with the name of the function, in 'dstahlke''s case 'red_error'

Comment by capncanuck 265 weeks and 1 day ago

Hmm, it seems to interfere with 'read'

Comment by capncanuck 265 weeks and 1 day ago

It won't die when you hit Ctrl-C. You have to kill a bash process which is a child of the command being run...

Comment by dstahlke 264 weeks and 1 day ago

Another odd option:

exec 3> >(while read line; do echo -e "\e[01;31m$line\e[0m"; done) some_command 2>&3

stderr from some_command will be displayed in red. This opens file handle #3 and pipes it to the subshell until that file handle is closed with exec 3>&-

Comment by mweed 257 weeks ago

Note that doing:

exec 2> >(while read line; do echo -e "\e[01;31m$line\e[0m"; done)

Will make the shell do exectly what is wanted. all stderr displays in red and stdout displays normally for the shell and commands executed in the shell. Unfortunately is also has the effect of not displaying the prompt and any input until input is completed. Anyone know how to get around this?

Comment by mweed 257 weeks ago

Faster to color with command: grep --color=auto '.*'

Comment by mjb 220 weeks and 6 days ago

Your point of view

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