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Shell Programming and Scripting
Need to find Unique not used Number
Post 302308648 by devtakh on Sunday 19th of April 2009 11:42:53 PM
04-20-2009
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Hi,
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input
a 1
a 2
a -1
b 1
b 2
b 3
output
a -1
b 1
Thanx
---------- Post updated at 09:42 PM ---------- Previous update was at 09:10 PM ----------
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LEARN ABOUT POSIX
sg
SG(1) User Commands SG(1) NAME
sg - execute command as different group ID SYNOPSIS
sg [-] [group [-c ] command] DESCRIPTION
The sg command works similar to newgrp but accepts a command. The command will be executed with the /bin/sh shell. With most shells you may run sg from, you need to enclose multi-word commands in quotes. Another difference between newgrp and sg is that some shells treat newgrp specially, replacing themselves with a new instance of a shell that newgrp creates. This doesn't happen with sg, so upon exit from a sg command you are returned to your previous group ID. CONFIGURATION
The following configuration variables in /etc/login.defs change the behavior of this tool: SYSLOG_SG_ENAB (boolean) Enable "syslog" logging of sg activity. FILES
/etc/passwd User account information. /etc/shadow Secure user account information. /etc/group Group account information. /etc/gshadow Secure group account information. SEE ALSO
id(1), login(1), newgrp(1), su(1), gpasswd(1), group(5), gshadow(5). shadow-utils 4.5 01/25/2018 SG(1)