Hi. I hope someone can help me with this problem.
Being a novice to Unix, I editted my crontab directly
by typing " crontab -e ". Well, I needed to make some
changes so, I typed " crontab -r ". Now I have no crontab,
and I can't seem to get crontab to write a new file.
I' ve tried:
vi... (4 Replies)
Hello everyone !
Please have a minute and see if you know how to script this
I have a file like this:
"create table ....
...
create index n112 on ...
...
create table ...
....
create index n113 on...
...
create table ...
create index n112 on ...! duplicate
... (1 Reply)
Hello,
I'm experimenting a problem on my rh server.
Red Hat Enterprise Linux AS release 3 (Taroon Update 8)
2.4.21-47.ELsmp #1 SMP i686 i686 i386 GNU/Linux
It started with a segmentation fault on
#id root
To resolve it, I've installed
coreutils-4.5.3-28.4.i386.rpm
But, I... (6 Replies)
Hello
I have moved a critical lib from its location, so all programms linked to libc dont work .
I still have two shells on the machine, bash and ksh
The only thing I see is copying back the lib, but of course : dd, cp , mv etc are dead .
So i tryed a loop with read ...
{^Jwhile read... (24 Replies)
Hi,
I am using Ubuntu 8.04 64-bit (Hardy Heron LTS Desktop edition) OS on a 64-bit intel hardware (x86_64). I have wrongly renamed the /lib64/libdl-2.7.so shared library file and now hardly few commands are working. My Gnome UI display has gone and I could not establish any new connection via... (12 Replies)
Hi everyone !
I have a file wich look like this :
>Sis01
> Sis02
...
>Sis44
I want to separe each paragraphe in a different file, so I decide to use the "FOR" loop + sed.
for f in {01..44}
do (5 Replies)
My whatis file is missing from my /usr/share/lib directory. I know I can recreate it by using catman -w command.
My question is, why do all of my other servers have it and this one doesn't. Maybe due to a recent move of old to new servers and it just wasn't copied over. Unlikely, 'cause all... (0 Replies)
Hi there can anyone help me to spot my mistake and please explain why it appears
My code :
#!/usr/bin/gawk -f
BEGIN { bytes =0}
{ temp=$(grep "datafeed\.php" | cut -d" " -f8)
bytes += temp}
END { printf "Number of bytes: %d\n", bytes }
when I am running ./q411 an411
an411:
... (6 Replies)
Hi All,
I connected via rlogin in testing environment (ksh ) and placed an executable with -rwxr-xr-x permission.
eg: from my own unix box used : rlogin host -l user
But the exe was renamed by somebody. since it's only renaming none of the access time , modification time etc is altered.... (2 Replies)
Hi...I'm new to Linux and was working on a home server. I have it operational with Samba Share as my NAS system. Unfortunately, while I was on Webmin I changed the Logical Volume Group Name and now I can't find the data I had saved on my Samba Server.
Can anyone help me recover those files?
... (0 Replies)
Discussion started by: pangil
0 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)