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Top Forums Shell Programming and Scripting Control cursor position also at bottom of window Post 303043691 by Ralph on Tuesday 4th of February 2020 06:35:01 AM
Old 02-04-2020
For some reason LINES is not set in a non-interactive shell - even if checkwinsize is on. (I'm using Bash 5.0 but noticed that back in Bash 4.4, Kali Linux (which is Debian 9) and Raspian, too:
Code:
$ echo $LINES
24
$ bash
$ echo $LINES
24
$ cat showLINES
#!/bin/bash

echo LINES=$LINES

$ shopt checkwinsize
checkwinsize       on
$ bash showLINES
LINES=
 $

Hence I use LINES=$(tput lines) in my script.


But this works:
Code:
$ . ./showLINES
LINES=24
$

 

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SHUF(1) 							   User Commands							   SHUF(1)

NAME
shuf - generate random permutations SYNOPSIS
shuf [OPTION]... [FILE] shuf -e [OPTION]... [ARG]... shuf -i LO-HI [OPTION]... DESCRIPTION
Write a random permutation of the input lines to standard output. Mandatory arguments to long options are mandatory for short options too. -e, --echo treat each ARG as an input line -i, --input-range=LO-HI treat each number LO through HI as an input line -n, --head-lines=LINES output at most LINES lines -o, --output=FILE write result to FILE instead of standard output --random-source=FILE get random bytes from FILE (default /dev/urandom) -z, --zero-terminated end lines with 0 byte, not newline --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. AUTHOR
Written by Paul Eggert. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for shuf is maintained as a Texinfo manual. If the info and shuf programs are properly installed at your site, the command info shuf should give you access to the complete manual. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+--------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+--------------------+ |Availability | SUNWgnu-coreutils | +--------------------+--------------------+ |Interface Stability | Uncommitted | +--------------------+--------------------+ NOTES
Source for GNU coreutils is available on http://opensolaris.org. shuf 6.7 December 2006 SHUF(1)
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