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Full Discussion: Regarding read command
Top Forums Shell Programming and Scripting Regarding read command Post 302203498 by krishna_gnv on Monday 9th of June 2008 03:36:08 AM
Old 06-09-2008
Regarding read command

Hi all,

What does -u option indicates in read command.

while read -u var1
do
.
.
done < file.txt
 

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resize(1X)							     MIT X11R4								resize(1X)

Name
       resize - utility to set TERMCAP and terminal settings to current window size

Syntax
       resize [-u] [-s [row col]]

Description
       The  uitility  prints  a  shell command for setting the TERM and TERMCAP environment variables to indicate the current size of xterm window
       from which the command is run. For this output to take effect, resize must either be evaluated as part of the command  line  (usually  done
       with  a	shell alias or function) or else redirected to a file which can then be read in. From the C shell (usually known as /bin/csh), the
       following alias could be defined in the user's .cshrc:

	   % alias rs 'set noglob; `eval resize`'

       After resizing the window, the user would type:

	   % rs

       Users of versions of the Bourne shell (usually known as /bin/sh) that do not have command functions will need to send the output to a  tem-
       porary file and the read it back in with the ``.'' command:

	   $ resize >/tmp/out
	   $ . /tmp/out

Options
       The following options may be used with resize:

       -u      This option indicates that Bourne shell commands should be generated even if the user's current shell is not /bin/sh.

       -c      This option indicates that C shell commands should be generated even if the user's current shell is not /bin/csh.

       -s [rows columns]
	       This option indicates that the Sun console escape sequences will be used instead of the special xterm escape code. If rows and col-
	       umns are given, resize will ask the xterm to resize itself. However, the window manager may choose to disallow the change.

Restrictions
       The -u or -c must appear to the left of -s if both are specified.

       There should be some global notion of display size; termcap and terminfo need to be rethought in the context of window systems.	(Fixed	in
       4.3BSD, and ULTRIX-32 1.2)

Files
       For the base termcap entry to modify.

       User's alias for the command.

See Also
       csh(1), tset(1), xterm(1X)

																	resize(1X)
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