I am a beginner in writing shell script (probably my 1st shell script). I have a shell script that I like to run. The command is a simple grep command based on the parameter passed to it. I managed to get the correct grep command using the script below.
FILE='testurls'
MERCHANT_ID='8'
printf "grep '^%s' %s\n" "$MERCHANT_ID" "$FILE"
./hello.sh
grep '^8' testurls
How would I execute the command instead of printing it.
printf is not necessary
FILE='testurls'
MERCHANT_ID='8'
grep "^$MERCHANT_ID" "$FILE"
You can use shell backticks quotes. This will store the output of executable commands.
Syntax are :-
1) Legacy Bourne shell backticks ``:
var=`grep "^$MERCHANT_ID" "$FILE"`
printf "%s\n" "$var"
2) $() syntax:
var=$(grep "^$MERCHANT_ID" "$FILE")
printf "%s\n" "$var"