sed -i.bak ‘s/string_to_replace/’$variablename’/g’ filename
The string to be replaced is, as usual, unquoted. However the variable to be used is single quoted. Contrary to normal Bash practise, the single quote expands instead of being literal.
Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.
His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.
When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.