hi all
by using cat /etc/passwd
I've got these output.
ajh1ect:x:839:501:Anthony:/home/ajh1ect:/bin/bash
mjb1ect:x:840:501:Michael:/home/mjb1ect:/bin/bash
mv3ect:x:841:501:Marian:/home/mv3ect:/bin/bash
now I want to see just the user ID and group ID.
so what is the code will be with... (2 Replies)
I met a problem in using grep -P.
There is a text file, temp.txt, whose content is:
dddd
abc
I ran the command:
grep -P "\s*abc" temp.txt
The result I expected is:
abc
But, the actual result is:
dddd
abc
Could anyone tell me what is wrong?
Thanks. (2 Replies)
I have two .txt files one called good.txt and the other one is called bad.txt. Both contain email addresses in the following format:
john@john.com
bob@bob.com
sarah@sarah.com
Basically, I want to scrub good.txt against bad.txt and save the resulting output in scrubbed.txt meaning that if... (2 Replies)
------------------------------------------------------------------
Ex of Warning messgae,(Many similar lines occure for Both Test and Test1)
-WARNING:Below Field not implemented in file File name: /home/test/
new/file1, msg buffer is:
:Test:000948
... (1 Reply)
Hi All,
I have a huge file, I need to two things from this file. I need to know the IP address or the hostname and second thing is the date&time.
The file looks like this and I need to get my data from this...
Trying...
Connected to 204.109.172.117.
Escape character is '^]'.
Fri... (4 Replies)
thanks for your reply.
but i'm not quite sure what your code is doing.
i may be using it wrong but i'm not getting what i'm supposed to get.
could you please elaborate?
thanks again, (6 Replies)
Thread1 {
x = 2
y = 10485
}
Thread2 {
x = 16
y = 1048
}
Thread3 {
x = 1
y = 1049
}
Thread4 {
x = 4
y = 1047
z = 500
}
Suppose the above is a piece of code. I need to automate and verify that the value of x under Thread1's 2.
There are several... (3 Replies)
Hi everyone,
I've got a problem with converting C comments ( /* */ ) into C++ style ( // ) in some source file with sed. So far I've dealt with comments on one line, but I don't know how to convert when it is over multiple lines ...
So I already have something like this:
comments.sed
... (8 Replies)
Discussion started by: kolage
8 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)