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Full Discussion: Searching for pattern in variable using case statements
Top Forums Shell Programming and Scripting Searching for pattern in variable using case statements Post 302977953 by drl on Sunday 24th of July 2016 01:25:12 PM
Old 07-24-2016
Hi.

It would probably be useful if you were to tell us which items the different platforms had in common: bash, ksh, zsh, awk, perl, grep, etc.

Here's a solution using an array, loop, and case:
Code:
#!/usr/bin/env bash

# @(#) s1       Demonstrate shell array with case selector.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { : ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
C=$HOME/bin/context && [ -f $C ] && $C

v1="gine is very bad
vine is pretty good"

pl " Input data variable, piped into cat:"
echo "$v1" | cat -n

pl " Input data array with printf:"
declare -a a1="$v1"
printf "%s\n" "${a1[*]}"

pl " Looking through each element in the array:"
IFS=$'\n'
for line in ${a1[*]}
do
  db " Working on line [$line]"
  case $line in
  (*vine*)      echo " HIT! Found vine." ;;
  esac
done

exit 0

producing:
Code:
$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.4 (jessie) 
bash GNU bash 4.3.30

-----
 Input data variable, piped into cat:
     1  gine is very bad
     2  vine is pretty good

-----
 Input data array with printf:
gine is very bad
vine is pretty good

-----
 Looking through each element in the array:
 db,  Working on line [gine is very bad]
 db,  Working on line [vine is pretty good]
 HIT! Found vine.

See man bash, etc. for details.

Best wishes ... cheers, drl
This User Gave Thanks to drl For This Post:
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LEARN ABOUT OPENSOLARIS

setusershell

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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