I have been reading through the sed one liners, trying to understand what is happening.
Code:
# delete the last 2 lines of a file
sed 'N;$!P;$!D;$d'
The above will delete the last 2 line of a file. I tried analyzing what happens. And I got lost
This is what I understood so far from the above.
N; Read the complete file into the pattern-space. $!P; Print upto last but one line. $!D; Delete upto the last-but one line $d Delete the last line in the pattern-space.
What is wrong in my analysis ? Please explain what the sed script does ?
Hi all,
I am trying to figure out the syntx to delete multiple lines w/ sed. I know the following syntax will delete lines 1 THROUGH 5 from filex:
sed 1,5d filex
But I wan to delete lines 1 AND 5 (keeping lines 2,3, and 4). Does anyone know how to do this in a single sed statement?
... (2 Replies)
hello all
I have bunch of files containing lines of text that surrounding by <# .......#> tags
I like to delete this lines from the text files whiteout open the files , can it be done with sed ?
or other unix tool (perl mybe )? (2 Replies)
I have a text file with blank lines fullfilled with spaces and others only containing the "Enter" caracter, the \012.
I would like to eliminate all them with the sed command.
Is it possible?
making: sed '/^$/d' <file should delete the blank lines but doesn't work for the lines that only... (2 Replies)
First of all, I know this can be more eassily done with perl or other scripting languages but, that's not the issue. I need this in sed. (or wander if it's possible )
I got a file (trace file to recreate the control file from oracle for the dba boys)
which contains
some lines
another line... (11 Replies)
Hi All,
I have one /etc/hosts.equiv file which has following entries
##########
wcars42g admin
wcars42b netmgr
wcars42b oemssrvr
wcars42f admin
wcars42f netmgr
wcars42f oemssrvr
##########
I am trying to delete lines starting from wcars42b.... (1 Reply)
Hi,
I'm very new to Sed and I have a very large file that contains data in the following way
(*064) 1 4 10
(*064) simulation time = 0.12000E-05
(*064) 1 2 10
(*064) 1 3 10Essentially what I want to do it delete every line that starts with
'(*064) 1'I tried the following,
... (2 Replies)
Hello everyone I'm doing a program in bash and wanted to know how can I do to delete document lines the words not ending in S with SED, ie, show only those ending with the letter S.
I probe with:
sed -e /$.*/d "$file" | more
to delete all lines NOT ending in S but not work!... (3 Replies)
Hello,
I'm trying to figure out how to use sed or awk to delete single lines in a file. By single, I mean lines that are not touching any other lines (just one line with white space above and below).
Example:
one
two
three
four
five
six
seven
eight
I want it to look like: (6 Replies)
Hi Members,
This is my first post in this forum.
I want to do is match form feed lines one by one in a file and delete the next n lines (ex-3 lines) with the form feed character
Eg - Files looks like
Data 1
Data 2
Data 3
FF
Hdr1
Hdr2
Hdr3
Data4
Data5
FF
Hdr1
Hdr2
Hdr3 (9 Replies)
Discussion started by: yohan
9 Replies
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)
05-30-2005
