Tag: script

Tip: use a regexp so the grep is not matching the line where is sits in ps list:

ps -aef | grep "[m]atchingexp" will match anything starting with letter 'm' and followed by 'atchingexp' , which will not be in the ps list as it will contain the [] around the first letter of your match

By default grep -coloris not producing color symbols if it detects that the output is not a terminal.

grep -color=auto is doing the same, that is not producing color symbols if it detects that the output is not a terminal.

The solution is to use ``grep -color=always`` in the place that need it.

Do not put it in an alias of grep as it would break some code somewhere else. Color symbols are strings like "ESC[35m" and they will be inserted in the text.

In case you're trying to search recursively for a specific file type and data mask, grep -r is not enough to bring the desired result.
You'll have to use --include 'type' and then, even if the directory does not contain any of the given filetype in root, it's still working.

Example;

grep -r --include '*.extension' 'Text to match' directory
grep -r --include '*.cpp' 'Audio' .

I did it using the JQ command line tool from https://stedolan.github.io/jq/

Exemple: list all json files from current directory and print the difference with updated jsons from updated/ directory

for user in  `ls updated-users`
do
    # print file name
    echo $user
    # simple 
    diff <(jq -S . users/$user) <(jq -S . updated-users/$user)
    # or full on one side and the diff on the other side
    # diff -y --left-column <(jq -S . users/$user) <(jq -S . updated-users/$user)
    # or full on one side and the diff on the other side, colored
    # diff -y --left-column --color  <(jq -S . users/$user) <(jq -S . updated-users/$user)
done

#shell #diff #json #script