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Full Discussion: Swapping or switching 2 lines using sed
Top Forums Shell Programming and Scripting Swapping or switching 2 lines using sed Post 302258647 by null7 on Saturday 15th of November 2008 06:25:52 AM
Old 11-15-2008
Quote:
Originally Posted by Franklin52
To swap line 3 with line 10:

Code:
#!/bin/sh
 
line=3
line1=10

awk -v var="$line" -v var1="$line1" 'NR==var {
  s=$0
  for(i=var+1;i<var1;i++){
    getline;s=$0"\n"s
  }
  getline;print;print s
  next
}1' file

Regards

Hi, I'm a newbie in unix script. Currently i'm using script for my daily job. Can anyone here explain in detail above script? I mean the syntax and command line by line. I do understand the script swap the 3rd line with line 10. If i want to swap line no 2 with line no 3, i just need to change variable line=2 and line1=3 right?

TQ.
 

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LEARN ABOUT LINUX

motd.tail

MOTD.TAIL(5)						   Debian Administrator's Manual					      MOTD.TAIL(5)

NAME

       motd.tail - Template for building the system message of the day

DESCRIPTION

       On Debian systems, the system message of the day is rebuilt at each startup, in order to display an accurate information. /etc/motd.tail is
       the file to edit permanent changes to the message of the day.

OVERVIEW

       The initiation script /etc/init.d/bootmisc.sh prepends a line containing information about the system  to  /etc/motd.tail  and  stores  the
       resulting  file in /var/run/motd. /etc/motd is a symbolic link to /var/run/motd.  This is done to prevent changes to /etc as the system can
       not assume /etc to be writable.

       Changes to /etc/motd effectively end up in a file under /var/run which will be regenerated upon reboot.

       A symbolic link to a different file, such as /etc/motd.static disables this behaviour.

FILES

       /etc/init.d/bootmisc.sh
	      The initiation script which builds /var/run/motd

       /etc/motd
	      Symbolic link to the system message of the day at /var/run/motd

       /etc/motd.tail
	      Template for building the system message of the day

       /var/run/motd
	      System message of the day file rebuilt at each computer start

SEE ALSO

       login(1), issue(5), motd(5).

Debian								    2007-04-28							      MOTD.TAIL(5)
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