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Top Forums UNIX for Dummies Questions & Answers Copying part of a data file into another Post 302830015 by Don Cragun on Sunday 7th of July 2013 09:53:25 PM
Old 07-07-2013
Here are a couple of ways to do it:
Code:
#!/bin/bash
echo 'processing datfile1 using while loop:'
while read x
do      if [ "$x" -gt 16000 ]
        then    printf "%d\n" "$x"
        fi
done < datfile1
echo 'processing datfile2 using awk:'
awk '$1 > 16000' datfile2

If datfile1 contains:
Code:
1
2
4
6
7       
8       
12
24996
24999

and datfile2 contains:
Code:
1
3
5
6
8       
9       
12
24999
25000

the output produced is:
Code:
processing datfile1 using while loop:
24996
24999
processing datfile2 using awk:
24999
25000

If you are running this on a Solaris system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of /bin/awk or /usr/bin/awk.

Although this was written using bash (as you requested), this script will work with any shell that recognizes basic Bourne shell syntax.
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/ksh93 /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/ksh93 /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/sfw/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. NOTES
Restricted shells should not be listed in /etc/shells. SunOS 5.11 1 Nov 2007 getusershell(3C)
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