NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet]
       [-s|--stealth] [-i|--interactive] [-b|--backup ext] [-e|--exec cmd] [-f|--file cmd-file]
       [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of
       files.

OPTIONS

       The following command line options are available.

       -v, --verbose
           Display some processing information.

       -t, --trace
           Enable the output of the essential shell commands which are executed.

       -n, --nop
           No operation mode. Actual execution of the essential shell commands which would be
           executed is suppressed.

       -w, --warning
           Show warning on substitution operation resulting in no content change on every file.
           The default is to show a warning on substitution operations resulted in no content
           change on all files.

       -q, --quiet
           Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
           Stealth operation. Preserve timestamp on file.

       -i, --interactive
           Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
           Preserve backup of original file using file name extension ext.  Default is to
           overwrite the original file.

       -e, --exec cmd
           Specify sed(1) command directly.

       -f, --file cmd-file
           Read sed(1) command from file.

EXAMPLE

        #   shell script
        shtool subst -i -e 's;(c) \([0-9]*\)-2000;(c) \1-2001;' *.[ch]

        #    RPM spec-file
        %install
            shtool subst -v -n \
                -e 's;^\(prefix=\).*;\1 $RPM_BUILD_ROOT%{_prefix};g' \
                -e 's;^\(sysconfdir=\).*;\1 $RPM_BUILD_ROOT%{_prefix}/etc;g' \
                `find . -name Makefile -print`
            make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall
       <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted by the need to have a
       uniform and convenient patching frontend to sed(1) operations in the OpenPKG package
       specifications.

SEE ALSO

       shtool(1), sed(1).