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Top Forums Shell Programming and Scripting Swapping the 1st 4 lines only Post 302947344 by RavinderSingh13 on Wednesday 17th of June 2015 10:58:22 AM
Old 06-17-2015
Hello invinzin21,

Following may help you in same.
Code:
 awk '{if(NR==1 || NR==2 || NR==3 || NR==4){A=A?A ORS $0:$0;next};if(NR==8){print $0 ORS A;} else {print}}'  Input_file

Output will be as follows.
Code:
this is line5
this is line6
this is line7
this is line8
this is line1
this is line2
this is line3
this is line4
this is line9
this is line10
this is line11

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
 

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shells(4)							   File Formats 							 shells(4)

NAME
shells - shell database SYNOPSIS
/etc/shells DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser- shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file. Blank lines are also ignored. The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list. Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)). FILES
/etc/shells lists shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.10 4 Jun 2001 shells(4)
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