i give
as example
but i want general operator that display output from last run command
So use one of the examples I gave you, but replace ls -l and wc -l with the commands you want to use.
If you would tell us what you really want to do instead of a fake example that reports an error if there is more than one file (with a name not starting with a period (".")) in a directory, we might be able to give you a template that will actually do what you want done.
I will admit I am a newbie but I am trying to write some simple scripts
Situation:
I have a list of IP Addresses that I want to once or 2 times a day store the average ping response time in a database (mysql) I am part way there but not all the way there
I have the following
cat ./slow... (2 Replies)
Hi,
I was wondering why ls * | echo does not print the contents of the directory to the screen? The way I see it, ls * returns a whole lot of information, and then we pipe all this info to echo, so surely it should all come to our screen!
Is there a serious flaw in my understanding?
... (3 Replies)
#!/bin/bash
INPUT=$1
if
then
INPUT=0$1
TRACKNUMBER=$INPUT
fi
TRACKNUMBER=$INPUT
echo "Track Number:" $TRACKNUMBER
if
then
echo "File Does Not Exist!: split-track"${TRACKNUMBER}".wav"
exit 0
fi
CUEFILE="$2" (6 Replies)
Hello,
I'm writing some bash scripts and I'm trying to get an echo command and the output of another command to display on the same line. For example:
I want to run
echo "Operating System: " unameand have it displayed as
Operating System: Darwin
Thanks for your help! (7 Replies)
Hi,
I have written a BASH shell script that contains a lot of "echo" commands to notify the user about what's going on. The script generates a log file that contains a copy of what is seen in the terminal. The echo statements are generally verbose, and thus extend out for quite a ways on one... (2 Replies)
Hi,
When I run the following command in terminal it works. The string TEST is appended to a file silently.
echo TEST | tee -a file.txt &>/dev/null
However, when I paste this same line to a file, say shell1.sh, and use bourne shell .
I run this file in terminal, ./shell1.sh.
However I... (1 Reply)
Hi,
I try to write script and echo two command at the same line .
echo "A"
echo "B"
How can I pipe above two command at the same line in text file .
So, in the output text file , you can see below ???
A B
not
A
B
Any sugggestion ??? (4 Replies)
Hi All,
I have code to get the UUID and capacity for the LUN from CX -arry. I need the output in this format
LUN Number UUID Space in MB
LUN 238 60:06:01:60:C2:56:11:00:28:36:67:59:11:04:DE:11 122880
But Now iam getting this... (3 Replies)
How do i echo the output of a unix command using shell script???
Like:
echo /etc/ ls -l (2 Replies)
Discussion started by: sunny2802
2 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)