qsgrep - prints matching patterns within a file.

       Pascal Buchbinder, http://mod-qos.sourceforge.net/

mod_qos utilities 11.74                             May 2023                                           QSGREP(1)

       qsgrep is a simple tool to search patterns within files. It uses regular expressions to find patterns and
       prints the submatches within a pre-defined format string.

       Shows the IP addresses of clients causing mod_qos(031) messages):

         qsgrep -e 'mod_qos\(031\).*, c=([a-zA-Z0-9:.]*)' -o 'ip=$1' error_log

       qsgrep - prints matching patterns within a file.

       -e <pattern>
              Specifies the search pattern.

       -o <string>
              Defines the output string where $0-$9 are substituted by the submatches of the regular expression.

       <path> Defines  the  input  file  to  process. qsgrep reads from from standard input if this parameter is
              omitted.

qsdt(1),  qsexec(1),  qsfilter2(1),  qsgeo(1),  qshead(1),  qslog(1),  qslogger(1),  qspng(1),   qsre(1),
       qsrespeed(1), qsrotate(1), qssign(1), qstail(1)

       qsgrep -e <pattern> -o <sub string> [<path>]