How to get "expr 1 + 2 = 03"? Post: 302483556

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why "expr "${REPLY}" : '$[1-9][[:digit:]]*$" can figure out whether it is a digit?

I found below script to check whether the variable is a digit in ksh. ############################ #!/bin/ksh REPLY="3f" if ]*\)'` != ${REPLY} && "${REPLY}" != "0" ]] then print "is digit\n" else print "not digit\n" fi ############################ Although it works fine, but...

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Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

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HowTo: reg expr doing grep "timestamp>$DesiredTime" logfile ?

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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)

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

why "expr "${REPLY}" : '\([1-9][[:digit:]]*\)" can figure out whether it is a digit?

Discussion started by: sleepy_11

2. UNIX for Dummies Questions & Answers

Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

Discussion started by: Lokesha

3. Shell Programming and Scripting

HowTo: reg expr doing grep "timestamp>$DesiredTime" logfile ?

Discussion started by: Browser_ice