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Top Forums Shell Programming and Scripting Strange Script behaviour with Grep Post 302972296 by Don Cragun on Tuesday 3rd of May 2016 10:58:04 PM
Old 05-03-2016
Because shell variables are not expanded inside single-quoted strings. (And, note that in your echo statement:
Code:
echo "grep '$LOGDATE' /tmp/logs/vel.log >10min_log"

single-quote characters are not special inside a double-quoted string; so in that case $LOGDATE is expanded because it is in a double-quoted string; not inside a single-quoted string.)
 

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