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Top Forums Shell Programming and Scripting Insert content of a file into another file before given pattern Post 302942881 by Don Cragun on Saturday 2nd of May 2015 06:05:54 PM
Old 05-02-2015
I usually find ed better suited for things like this than sed. Try:
Code:
#!/bin/ksh
ed -s x1 <<-EOF
	H
	/BBB/-1r x2
	w somefile
	q
EOF

The ed H command will give you a semi-useful diagnostic if the pattern you're looking for is not present in the input file.

This will save the updated contents in a file name somefile. If you want to update x1 instead of creating a new file; change:
Code:
	w somefile

to just:
Code:
	w

If you want the update written to standard output instead of to a file, change the lines:
Code:
	w somefile
	q

to:
Code:
	,p
	Q

This User Gave Thanks to Don Cragun For This Post:
 

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getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME
getusershell, setusershell, endusershell - get legal user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If /etc/shells does not exist, the following locations of the standard system shells are used in its place: /bin/bash /bin/csh /bin/jsh /bin/ksh /bin/pfcsh /bin/pfksh /bin/pfsh /bin/sh /bin/tcsh /bin/zsh /sbin/jsh /sbin/pfsh /sbin/sh /usr/bin/bash /usr/bin/csh /usr/bin/jsh /usr/bin/ksh /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/xpg4/bin/sh The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells. The setusershell() function rewinds the file or the list. The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells. RETURN VALUES
The getusershell() function returns a null pointer on EOF. BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved. SunOS 5.10 30 Aug 2004 getusershell(3C)
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