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Full Discussion: grouping of objects and print their number
Top Forums Shell Programming and Scripting grouping of objects and print their number Post 302138930 by Yogesh Sawant on Thursday 4th of October 2007 01:49:10 AM
Old 10-04-2007
in Perl:
Code:
#!/usr/bin/perl
# count_letters.pl
use strict;
my %letters;
while (<>) {
    chomp;
    $letters{$_}++;
}
foreach my $letter (keys (%letters)) {
    print "$letter = $letters{$letter} \n";
}

Code:
[ysawant@in-gcs-nas1 temp]$ perl  count_letters.pl  letters_file 
H = 3 
N = 2 
K = 4 
L = 1 
[ysawant@in-gcs-nas1 temp]$

 

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LEARN ABOUT CENTOS

chsh

CHSH(1) 							   User Commands							   CHSH(1)

NAME

       chsh - change your login shell

SYNOPSIS

       chsh [-s shell] [-l] [-u] [-v] [username]

DESCRIPTION

       chsh is used to change your login shell.  If a shell is not given on the command line, chsh prompts for one.

       chsh is used to change local entries only. Use ypchsh, lchsh or any other implementation for non-local entries.

OPTIONS

       -s, --shell shell
	      Specify your login shell.

       -l, --list-shells
	      Print the list of shells listed in /etc/shells and exit.

       -u, --help
	      Print a usage message and exit.

       -v, --version
	      Print version information and exit.

VALID SHELLS

       chsh  will  accept  the full pathname of any executable file on the system.  However, it will issue a warning if the shell is not listed in
       the /etc/shells file.  On the other hand, it can also be configured such that it will only accept shells listed in this	file,  unless  you
       are root.

EXIT STATUS

       Returns 0 if operation was successful, 1 if operation failed or command syntax was not valid.

SEE ALSO

       login(1), passwd(5), shells(5)

AUTHOR

       Salvatore Valente <svalente@mit.edu>

AVAILABILITY

       The chsh command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							     July 2009								   CHSH(1)
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