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Top Forums Shell Programming and Scripting Check if time format is valid Post 302958146 by RavinderSingh13 on Tuesday 20th of October 2015 03:27:25 AM
Old 10-20-2015
Hello erin00,

Could you please try following and let me know if this helps.
Code:
cat script.ksh
echo $1 | awk -F ':' '{match($0,/[0-2][0-4]:[0-5][0-9]:[0-5][0-9]/);A=substr($0,RSTART,RLENGTH);if(A  && $1 !~ /24/){ print "good"}  else {print "bad" }}'

After running script above following will be the output.
Code:
./script.ksh 12:34:21
good
./scrpit.ksh 26:67:92
bad
./script.ksh 24:17:12
bad

You could use string Invalid in place of bad which I have used above. Also on a Solaris/SunOS system, change awkto /usr/xpg4/bin/awk , /usr/xpg6/bin/awk , or nawk.

Thanks,
R. Singh

Last edited by RavinderSingh13; 10-20-2015 at 04:36 AM..
 

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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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