Syntax highlighting/colorizing cat
Is there a method to colorize the output of cat
, the way grep
does.
For grep
, in most consoles it displays a colored output highlighting the searched keywords. Otherwise, you can force it by calling grep --color
Is there a generic way to color the output of any program according to your personal choice.
From what I understand, the program itself is not responsible for the colors. It is the shell.
I am using the default shell in FreeBSD 5.2.1 which looks like it has never seen colors since epoch.
cat
with syntax highlighting is simply out of scope. cat
is not meant for that. If you just want to have the entire content of some file coloured in some way (with the same colour for the whole file), you can make use of terminal escape sequences to control the color.
Here's a sample script that will choose the colour based on the file type (you can use something like this instead of invoking cat
directly):
#!/bin/bash
fileType="$(file "$1" | grep -o 'text')"
if [ "$fileType" == 'text' ]; then
echo -en " 33[1m"
else
echo -en " 33[31m"
fi
cat $1
echo -en " 33[0m"
The above (on a terminal that supports those escape sequences) will print any text file as 'bold', and will print any binary file as red. You can use strings
instead of cat
for printing binary files and you can enhance the logic to make it suit your needs.
I'd recommend pygmentize
from the python package python-pygments
. You may want to define the following handy alias (unless you use ccat
from the ccrypt package).
alias ccat='pygmentize -g'
And if you want line numbers:
alias ccat='pygmentize -g -O style=colorful,linenos=1'
Options:
pygmentize is good. I have an alias:
alias c='pygmentize -g'
but highlight is another widely available alternative is
alias cats='highlight -O ansi --force'
Installation:
You may have to install pygments
using:
sudo pip install pygments
sudo easy_install Pygments #for Mac user
and for highlight
package which is easily available on all distributions
sudo apt-get install highlight
sudo yum install highlight
In Action:
I'm attaching shots for both down below for a good comparison in highlightings
Here is pygmentize
in action:
and this is highlight
:
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