To anyone who asks which Unix is the best... or which one I should use...
Probably the best timeline I have ever seen.
Read this link... http://www.levenez.com/unix/history.html#08 (0 Replies)
Hi
I have recently joined a bank as a tester. Initially I will be working on some test scripts and then I will be testing their data warehouse using SQL and Unix. I do have a very basic knowledge and understanding of both unix and sql. I am not sure how I will be using Unix to test their ... (2 Replies)
Need to automate the following steps (OS--> AIX )
1. cd /advx/R8.1MR2/TOP/logs ( I navigate to this directory)
2. Monitor the current date ULOG for specific error pattern
=> ls -lrt ULOG.08*
-rw-rw-rw- 1 vssrt vssgrp 24370 Aug 01 23:57 ULOG.080112
-rw-rw-rw- 1 vssrt vssgrp ... (6 Replies)
This is an excellent video comment on modern society and the remix is good too:
https://www.youtube.com/watch?v=5DU1B_XkyIk
5DU1B_XkyIk
Watch the video above and post your comments. (3 Replies)
Nice UNIX history article by John Loeffler, February, 05th 2019
UNIX: Building The Most Important OS in the World
The most widely used operating system in the world was a project born out of failure. (0 Replies)
UNIX.com Hello World HUD YT Video
https://youtu.be/cs3dbPnzDV4
Check it out!
Subscribe, Like, Share, Comment .
Cyber Dystopia (Ep. 2) - The Myth of the Singularity Coming Soon! (3 Replies)
Discussion started by: Neo
3 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS --debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.16.3 2010-06-11 SHELL-QUOTE(1)