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lang-bash
MasterFile.txtwill have thousands of entries. Do you recommend a faster/more efficient way of searching for the strings?grep - qis already very fast, as it will quit as soon as it finds a match. The other thing you may try is to make the pattern more specific. This may possibly be done by anchoring the pattern to the beginning and/or end of the line (I haven't benchmarked to see if this actually makes a difference).grep -ql, which will stop at the first match rather than proceeding through the rest of the file.vimseems to DTRT: i.imgur.com/4QJwi88.png Also, you canset -uto make referencing an unset or undeclared variable an error condition which will cause the script to terminate.