I'm trying to remove '--X' from the whole file and using variables replace $oldvar with $newvar.
I have tried with double quotes but it doesn't seem to work. $newvar is set to /usr/bin/bash. Would appreciate some guidance.
newvar=$(which bash)
oldvar=/bin/bash
sed "s/^--X//;1s#!$oldvar#!$newvar#" <infile >outfile
Input is:
echo $newvar
$ /usr/bin/bash
cat infile
--X#!/bin/bash
Result is:
#!/bin/bash