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Full Discussion: sed substitue whole file + 1 substitue with variables on one sed line?.
Top Forums Shell Programming and Scripting sed substitue whole file + 1 substitue with variables on one sed line?. Post 302987065 by itman73 on Sunday 4th of December 2016 11:43:32 AM
Old 12-04-2016
sed substitue whole file + 1 substitue with variables on one sed line?.
I'm trying to remove '--X' from the whole file and using variables replace $oldvar with $newvar.

I have tried with double quotes but it doesn't seem to work. $newvar is set to /usr/bin/bash. Would appreciate some guidance.

Code:
newvar=$(which bash)
oldvar=/bin/bash
  
sed "s/^--X//;1s#!$oldvar#!$newvar#" <infile >outfile

Input is:
Code:
echo $newvar
$ /usr/bin/bash

cat infile
--X#!/bin/bash

Result is:
Code:
#!/bin/bash

 

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LEARN ABOUT SUNOS

shells

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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