in reply to Wish to keep only those lines which start with letter s, and delete all other lines.

Another varient on the -pi.bak -e ("pi bake") schemata, but using the powers of the "ni bake":

perl -ni.bak -e'print if /^s/'

perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^+*`^ ve^#$&V"+@( NO CARRIER'

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