Im trying to connect to a particular IP address and I'm tying to use gethostbyaddr() and inet_addr() to do this. However, when I tried using inet_addr(), I always get a return value of 0 when I tried to connect to "172.21.16.238". Hope someone here could help me on this. I already tried using inet_... (1 Reply)
Is there a command where I can pipe my grep into it and it will output it with spaces rather than returns?
Example
I want to turn
prompt$ grep blah file
blah
blah
into this
prompt$ grep blah file | someCommand
blah blah (1 Reply)
Hi all!
I've faced with very unintelligible error using find/grep like this:
root@v29221:~# find /var/www/igor/data/www/lestnitsa.ru | grep u28507I get nothing as a result, but:
root@v29221:~# grep u28507 /var/www/igor/data/www/lestnitsa.ru/_var.inc
$db_name = 'u28507';... (2 Replies)
my intension is to use a grep command inside the shell script
and if any row is returned or not..
depending on the resultset i have to code on further.
how to check this
i mean.. could anyone help me out with the if condition how to use it here !! (4 Replies)
I’m trying to modify someone perl script to fix a bug. The piece of code checks that the zone name you want to add is unique. However, when the code runs, it finds a partial match using grep, and decides it already exists, so the “create” command exits.
$cstatus = `${ZADM} list -vic | grep... (3 Replies)
I get an error when I grep my results into a variable when the grep finds more than one file.
FND="$(find ediout* -mmin -60)"
if ; then
STR="$(find ediout* -mmin -60 -exec grep -l "ERRORS Encountered" {} +)"
fi
When there is only one ediout file it works fine. How do I... (11 Replies)
Hi all. I am trying to compare and filter two files. I have a bigfile.txt of names and ids and a smallfile.txt of ids only. What I am trying to do is use a while read loop to read the ids in the bigfile and then echo the name and id only if the id exists in the small file. Basically, I'm trying to... (5 Replies)
Hi,
I need to return a value from the function. the value will be the output from cat command which uses random fucntion.
#!/bin/ksh
hello()
{
var1=$(`cat /dev/urandom| tr -dc 'a-zA-Z0-9-!%&()*+,-/:;<=>?_'|fold -w 10 | head -n 1`)
echo "value is" var1
return var1
}
hello
var=$?... (2 Replies)
This returns 0 even when it does not delete any files.
Is it because -print returns 0?
RETVAL=$?
Docs_Backups=/media/andy/MAXTOR_SDB1/Ubuntu_Mate_18.04/Documents_Backups/
Scripts_Backups=/media/andy/MAXTOR_SDB1/Ubuntu_Mate_18.04/Script_Backups/
# create some old files
#touch -d 20120101... (4 Replies)
Discussion started by: drew77
4 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)