Modify shell variables using sed with POSIX compliance

user_7546702 0
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I have this shell variable:

#!/bin/sh
namelist="John Doe
Josh Franklin
John Adams
"

To delete the lines containing "John", I use:

namelist=$(sed '/John/d' <<< "$namelist")

However, after checking for POSIX compatibility from the website called Shellcheck,

it says that

In POSIX sh, here-strings are undefined.

So what would be the POSIX compliant way of modifying a variable using sed?

sed posix shell unix
2 Answers

what would be the POSIX compliant way of modifying a variable using sed?

Just don't use <<< and just output it to sed.

 namelist=$(printf "%s\n" "$namelist" | sed '/John/d')
user_90727530

Try this

namelist="John Doe
Josh Franklin
John Adams
"
namelist=$(IFS=$'\n';for name in ${namelist}; do echo ${name} | grep -v "John"; done)

echo "${namelist}"

You can get similar output using sed aswell

namelist="John Doe
Josh Franklin
John Adams
"
namelist=$(IFS=$'\n';for name in ${namelist}; do echo ${name} | sed '/John/d'; done)

echo "${namelist}"
user_106250940
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