It looks for at least one character that is not a '|' ( [^|] ) at the start of the line plus the first '|' and stores it in variable 1 it stores the rest of the line in variable 2. Then it prints variable 2 followed by variable 1 ( \2\1 ). IMO in practice it is equivalent to:
Last edited by Scrutinizer; 06-29-2010 at 06:37 AM..
This User Gave Thanks to Scrutinizer For This Post:
Hi,
Could you please explain me the below statement -- phrase wise.
sed -e :a -e '$q;N;'$cnt',$D;ba' abc.txt > xyz.txt
if suppose $cnt contains value: 10
it copies last 9 lines of abc.txt to xyz.txt
why it is copying last 9 rather than 10.
and also what is ba and $D over there in... (4 Replies)
Hi,
The following command works fine for me, but I could not grasp the logic working behind of sed command, it's obscure to me :( :confused:
echo "./20080916/core/audioex.amr" | sed "s%\(\)/%\1_%g"
o/p: ./20080916_core_audioex.amr
Could anyone please explain to me in detail, that how... (6 Replies)
Hello everyone,
I found this command line in a website:
perl -pi.bak -we's/\z/Your new line\n/ if $. == 2;' your_text_file.txt
With this command line you can insert a new line anywhere you want in a text without overwriting what's in it.
-p causes perl to assume a loop around your... (4 Replies)
This is my first post so hi to you all. I have browsed these forums in the past and what a great community and resource this is! Thanks to all the contributors ... I look forward to being able to give something back.
In the meantime, I have a little conundrum concerning sed. My very simple... (6 Replies)
Hi Friends,
I am trying to modify a script .The script contains this line:
sed -n -e 's_.*>\(.*\)<.*_\1_p' filename.xml
I am not great in sed command.I know, it is regular expression
to match a pattern string that starts with s_ and ends with 1_.I doesnot give the desired result.
Can... (4 Replies)
sed '$!N; /^\(.*\)\n\1$/!P; D'
i found this file which removes duplicates irrespective for sorted or unsorted file. keep first occurance and remove the further occurances.
can any1 explain how this is working..
i need to remove duplicates following file. duplicate criteria is not the... (3 Replies)
can anyone please tell me what does this expression means , i am under probation and need some explanation :)
$AUDIT_DIR -type f -mtime +$AUDIT_EXPIRE \ -exec rm {} > /dev/null 2>&1 \;
AUDIT_DIR="/var/log/"
AUDIT_EXPIRE='30'
Please use code tags! (4 Replies)
Hi everyone,
I am wondering if someone could please break down and explain the following sort command for me:
ls ${DEST_LOCATION}/${FILES} | sort -rt -k 4,4n | head -1
I have tried working it out using 'man sort', but on AIX there is not a great explanation of this function. I know that... (9 Replies)
Hi Folks,
I am struggling to understand nawk command which was used by another developer.
Can you please explain what each character or string is doing here below:
if ; then (3 Replies)
Discussion started by: kirans.229
3 Replies
LEARN ABOUT DEBIAN
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)