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rev(1) [centos man page]

REV(1)								   User Commands							    REV(1)

rev - reverse lines of a file or files SYNOPSIS
rev [options] [file ...] DESCRIPTION
The rev utility copies the specified files to standard output, reversing the order of characters in every line. If no files are specified, standard input is read. OPTIONS
-V, --version Output version information and exit. -h, --help Output help and exit. SEE ALSO
The rev command is part of the util-linux package and is available from Linux Kernel Archive < linux/>. util-linux September 2011 REV(1)

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WALL(1) 							   User Commands							   WALL(1)

wall -- write a message to users SYNOPSIS
wall [-n] [-t TIMEOUT] [file] DESCRIPTION
Wall displays the contents of file or, by default, its standard input, on the terminals of all currently logged in users. The command will cut over 79 character long lines to new lines. Short lines are white space padded to have 79 characters. The command will always put carriage return and new line at the end of each line. Only the super-user can write on the terminals of users who have chosen to deny messages or are using a program which automatically denies messages. Reading from a file is refused when the invoker is not superuser and the program is suid or sgid. OPTIONS
-n, --nobanner Supress banner -t, --timeout TIMEOUT Write timeout to terminals in seconds. Argument must be positive integer. Default value is 300 seconds, which is a legacy from time when people ran terminals over modem lines. -V, --version Output version and exit. -h, --help Output help and exit. SEE ALSO
mesg(1), talk(1), write(1), shutdown(8) HISTORY
A wall command appeared in Version 7 AT&T UNIX. AVAILABILITY
The wall command is part of the util-linux package and is available from util-linux April 2011 util-linux
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