PIP packages example:

1. wheel==0.37.1
2. ansible==0.29.10
3. setuptools<45

Need to get exactly delimiter to verify installed package opposite required package:

wheel==0.37.1 output "="

setuptools<45 output "<"

Please help

CodePudding user response：

Is this what you're trying to do (where file contains all 3 of your posted sample input lines just for testing with)?

$ grep -Eo '[<=] ' file
==
==
<

Original guesses:

$ awk -F'[<=] ' '{print $1}' file
wheel
ansible
setuptools

$ awk -F'[<=] ' '{print $2}' file
0.37.1
0.29.10
45

CodePudding user response：

var1="wheel==0.37.1"

var2="setuptools<45"

echo $var1 | grep -Eo '[<=] ' OUTPUT "=="

echo $var2 | grep -Eo '[<=] ' OUTPUT "<"

CodePudding user response：

You could transform the whole requirement file to something that the shell can read:

#!/bin/bash

while read -r pkg op vers
do
    echo "pkg='$pkg' op='$op' vers='$vers'"
done < <(
    b='[:blank:]'
    sed -nE 's/'"^[$b]*([^=<>~!#$b] )[$b]*([<>=~!]=|[<>])[$b]*([^#$b] ).*"'/\1 \2 \3/p' file.req
)