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awk delimeter

awk delimeter


how to explain that awk in red doesn't return version numbers?
is it caused by ++- in the variable?
is it possible to get it working with the variable?


$ A="libstdc++-devel"
$ rpm -qa|grep ^${A}-[0-9]
$ rpm -qa|grep ^${A}-[0-9]|awk -F "${A}" '{print $2}'|cut -d- -f2-

$ A="zlib"
$ rpm -qa|grep ^${A}-[0-9]|awk -F "${A}" '{print $2}'|cut -d- -f2-

RE: awk delimeter


The FS ( field separator ) is a regular expression and + is quantifier ( meaning previous entity 1 or more times ) in regular expressions.

You have to escape it : awk -F "libstdc\\\\+\\\\+-devel" '{print $2}'

Or using variable A : awk -F "${A//+/\\\\+}" '{print $2}'

Tested in Bash and MKsh. ( In Bash 3 backslashes ( \ ) are enough, 4 works in both. )


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