period=${1:-60} ## default to every 60 seconds
while :
do
sleep $period &
igal -a -r -U -w 6
wait
done
Or, put an entry in your contab file.
Or, if you have the watch command:
Code:
watch -n "$period" igal -a -r -U -w 6
etc., etc., etc....
Using the watch command, is there a way to echo the output to a logfile?
I run root-tail on my desktop and would like to see the result show up their.
Generically speaking, what is the bash script syntax that will echo any output that normally wouldn't be displayed--I know it's broad and vague, sorry.
Lastly, does anyone know which logfile has the unix/linux system main console? If I'm not mistaken doesn't every application echo something somewhere? E.g. when you launch say firefox from the bash prompt you all kinds of output, isn't this and all aps echo some kind of content to a "core" log file?
I'm sure I'm doing something wrong but as I am new to bash shell scripting I'm not sure what:
Here's the code
webalizer.conf is sitting in the same directory as this file which is named webalizer.sh. Can someone tell me if I've got the syntax right -- it that's correct? I'm executing the... (3 Replies)
Hi guys, I'm new to the forum so forgive me if I'm sounding ... daft.
I currently work in a Tech Support role. Every day we have to generate data by running around 10 .sh scripts. I was thinking instead of having to ./filename 10 times is it possible to right a new script that will run these for... (16 Replies)
I am writing a shell script in bash one of the thing I want to show is size of export /home
du -sk /export/home/oracle | cut -c 1-5
echo "kbytes"
when I run the script kbytes shows up in the second line, How can I append kbytes on the same line, such as
61233 kbytes
please guide
thanks (2 Replies)
I have a bash script, but it needs to have a simple protection with password.
So if a user wants to run the script , there should be a kdialog to asks for a password.If the password is correct the script starts to run.
It should not be the passord of root or another admin user.Just a password in... (2 Replies)
to gather the cpu utilization from a system in 5 minute intervals and direct output to file.
I'm new at scripting and while this seems like an easy task I'm confused on where to start. thanks for any help (1 Reply)
Hi to everyone here,
I'm a new user and relatively-new linuxer.
I'm trying to write a script that checks if every file from a directory is present in a given list and if not, delete it.
should be simple. But I think I've done half the work only:
this is to create the reference list:
for c... (2 Replies)
This is the command. Assume file1 exists but file2 does not:
ls file1 file2 >newfile 2>&1
This simply makes a text file with two lines: file1 \n file2 could not be found. What I don't understand is that when you run this command: ls file1 file2 >newfile, it prints "file2 could not be found" to... (1 Reply)
I have a text file called file1 which contains the text: "ls -l"
When I enter this command:
bash < file1 > file1
file1 gets erased. However if I enter this command:
bash < file1 > newfile
the output from "ls -l" is stored in newfile. My question is why doesn't file1's text ("ls -l") get... (3 Replies)
Hello all!
This is my first post and I'm very new to programming. I would like help creating a simple perl or bash script that I will be using in my work as a junior bioinformatician.
Essentially, I would like to take a tab-delimted or .csv text with 3 columns and write them to a "3D" matrix:
... (16 Replies)
Well I searched the net with varying success, but it seems kinda hard to find a one/max 2 lined command to:
strip all *.png files in the folder from their first two characters.
Any help is appreciated.
In DOS commandline of course... (17 Replies)
Discussion started by: pasc
17 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)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 v5.8.4 2005-05-03 SHELL-QUOTE(1p)