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Full Discussion: Assistance required to decode sed search using /1
Top Forums UNIX for Beginners Questions & Answers Assistance required to decode sed search using /1 Post 303035611 by sand1234 on Wednesday 29th of May 2019 10:07:19 AM
Old 05-29-2019
Assistance required to decode sed search using /1
Hi,

I am trying to extract line number (first number), as well as everything from TSVal onwards.

Code:
 4   1.474005 172.18.124.142 -> 74.125.228.46 TCP 2450940617 74 44021 > https [SYN] Seq=0 Win=5840 Len=0 MSS=1380 SACK_PERM=1 TSval=2450940617 TSecr=0 WS=64
  6   1.488149 172.18.124.142 -> 74.125.228.46 TCP 2450940637 66 44021 > https [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSval=2450940637 TSecr=1834617706

The following sed regex accomplishes this, but I have a few questions around the expression.

Code:
$ cat tcp_timestamps.txt | sed 's/\([0-9]\) .*TSval/\1 TSval/'
 4 TSval=2450940617 TSecr=0 WS=64
  6 TSval=2450940637 TSecr=1834617706

1> Why does [0-9] need to be grouped into brackers?
2> What is the purpose of \1 TSval? If /1 denotes the last element which is remembered, how does it apply here?

Thanks,
 

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LEARN ABOUT LINUX

shtool-subst

SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

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).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)
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