There is this line in a shell script i have seen:
grep -e ERROR ${LOG_DIR_PATH}/${LOG_NAME} > /dev/null
if [ $? -eq 0 ]
There is this line in a shell script i have seen: grep -e ERROR
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There is this line in a shell script i have seen:
grep -e ERROR ${LOG_DIR_PATH}/${LOG_NAME} > /dev/null
if [ $? -eq 0 ]
It’s checking the return value (
$?) ofgrep. In this case it’s comparing it to 0 (success).Usually when you see something like this (checking the return value of grep) it’s checking to see whether the particular string was detected. Although the redirect to
/dev/nullisn’t necessary, the same thing can be accomplished using-q.