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Shell Programming and Scripting
Replace line in files using script.
Post 302424401 by Hempe on Tuesday 25th of May 2010 06:51:30 AM
05-25-2010
Replace line in files using script.
First sorry for my bad english.
I have search the forum without finding anything I fully understand, so I ask here.
The problem:
I have a config file that I will chance onece a day. One line only.
I know the linenumber, and I also know the start of the line.
Line number 19, and the start of the line is "H: 10.0.0.9 60110 user1 user1"
I want to replace the whole line with a predefine variable $newline, the rest I have figured out for my self, but now I am stuck...
So... How do I locate the linenumber or the known start of the line, and how do I replace that line with a new line stored in a variable, then save and close the file...
The filename is "debsvr.cfg" and is located in "/var/etc/" on a debian server.
I am pretty new at shell scripting, so if you can please explain so my kid will understand it :P
Many thanks in advance
I have search the forum without finding anything I fully understand, so I ask here.
The problem:
I have a config file that I will chance onece a day. One line only.
I know the linenumber, and I also know the start of the line.
Line number 19, and the start of the line is "H: 10.0.0.9 60110 user1 user1"
I want to replace the whole line with a predefine variable $newline, the rest I have figured out for my self, but now I am stuck...
So... How do I locate the linenumber or the known start of the line, and how do I replace that line with a new line stored in a variable, then save and close the file...
The filename is "debsvr.cfg" and is located in "/var/etc/" on a debian server.
I am pretty new at shell scripting, so if you can please explain so my kid will understand it :P
Many thanks in advance
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LEARN ABOUT LINUX
shtool-mdate
SHTOOL-MDATE.TMP(1) GNU Portable Shell Tool SHTOOL-MDATE.TMP(1) NAME
shtool-mdate - GNU shtool pretty-print last modification time SYNOPSIS
shtool mdate [-n|--newline] [-z|--zero] [-s|--shorten] [-d|--digits] [-f|--field-sep str] [-o|--order spec] path DESCRIPTION
This command pretty-prints the last modification time of a given file or directory path, while still allowing one to specify the format of the date to display. OPTIONS
The following command line options are available. -n, --newline By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is omitted. -z, --zero Pads numeric day and numeric month with a leading zero. Default is to have variable width. -s, --shorten Shortens the name of the month to a english three character abbreviation. Default is full english name. This option is silently ignored when combined with -d. -d, --digits Use digits for month. Default is to use a english name. -f, --field-sep str Field separator string between the day month year tripple. Default is a single space character. -o, --order spec Specifies order of the day month year elements within the tripple. Each element represented as a single character out of ``"d"'', ``"m"'' and ``"y"''. The default for spec is ``"dmy"''. EXAMPLE
# shell script shtool mdate -n / shtool mdate -f '/' -z -d -o ymd foo.txt shtool mdate -f '-' -s foo.txt HISTORY
The GNU shtool mdate command was originally written by Ulrich Drepper in 1995 and revised by Ralf S. Engelschall <rse@engelschall.com> in 1998 for inclusion into GNU shtool. SEE ALSO
shtool(1), date(1), ls(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-MDATE.TMP(1)