How to set font color for STDOUT and STDERR

Question

I want to differentiate the STDOUT and STDERR messages in my terminal. If a script or command is printing a message in terminal I want to differentiate by colors; is it possible?

(E.g. stderr font color is red, and stdout font color is blue.)

Example (using bold):

$date
Wed Jul 27 12:36:50 IST 2011

$datee
bash: datee: command not found

$alias ls
alias ls='ls --color=auto -F'

$aliass ls
bash: aliass: command not found

Answer 1

Create a function in a bash shell or script:

color()(set -o pipefail;"$@" 2>&1>&3|sed $'s,.*,\e[31m&\e[m,'>&2)3>&1 

Use it like this:

$ color command -program -args 

It will show the command's stderr in red.

Keep reading for an explanation of how it works. There are some interesting features demonstrated by this command.

• color()... — Creates a bash function called color.
• set -o pipefail — This is a shell option that preserves the error return code of a command whose output is piped into another command. This is done in a subshell, which is created by the parentheses, so as not to change the pipefail option in the outer shell.
• "$@" — Executes the arguments to the function as a new command. "$@" is equivalent to "$1" "$2" ...
• 2>&1 — Redirects the stderr of the command to stdout so that it becomes sed's stdin.
• >&3 — Shorthand for 1>&3, this redirects stdout to a new temporary file descriptor 3. 3 gets routed back into stdout later.
• sed ... — Because of the redirects above, sed's stdin is the stderr of the executed command. Its function is to surround each line with color codes.
• $'...' A bash construct that causes it to understand backslash-escaped characters
• .* — Matches the entire line.
• \e[31m — The ANSI escape sequence that causes the following characters to be red
• & — The sed replace character that expands to the entire matched string (the entire line in this case).
• \e[m — The ANSI escape sequence that resets the color.
• >&2 — Shorthand for 1>&2, this redirects sed's stdout to stderr.
• 3>&1 — Redirects the temporary file descriptor 3 back into stdout.

Answer 2

Here's a hack that I thought of and it seems to work:

Given the following aliases for readability:

alias blue='echo -en "\033[36m"' alias red='echo -en "\033[31m"' alias formatOutput='while read line; do blue; echo $line; red; done' 

Now, you need to first set the font color in your terminal to red (as the default, which will be used for stderr). Then, run your command and pipe the stdout through formatOutput defined above (which simply prints each line as blue and then resets the font color to red):

shell$ red shell$ ls / somenonexistingfile | formatOutput 

The above command will print in both stderr and stdout and you'll see that the lines are coloured differently.

Hope this helps

---

UPDATE:

To make this reusable, I've put it all in a small script:

$ cat bin/run  #!/bin/bash echo -en "\033[31m"  ## red eval $* | while read line; do     echo -en "\033[36m"  ## blue     echo $line     echo -en "\033[31m"  ## red done echo -en "\033[0m"  ## reset color 

Now you can use this with any command:

$ run yourCommand