Hi ,
I am facing a problem .. which looks simple... but took 2 days of mine.. even now it is not solved completely..
I have one variable..., want to know whether that variable contains number... canbe +ve or -ve ...
Values
+35 --- number
-43 --- number
45A -- non number... (12 Replies)
Hi,
I have a log file, where i am required to identify the line number, where a particular string/line appears in the log file.
And then copy 200 lines above that line number to a new file.
Can someone provide pointers on how to write this script or what command to be used ?
Any... (2 Replies)
Hey I'm new in linux,
I'm looking for a code to check whether the parameter is a number or a string.
I have already tried this code:
eerste=$(echo $1 | grep "^*$">aux)
if
But it doesn't work.:confused:
Thanks (2 Replies)
This is what I have so far
grep -lir "some text" *
I need to check all files on the system for this text, if the text is found I need to change the file permissions so only ROOT has read and write access.
How can this be done? (3 Replies)
Hi,
I am having a problem in converting a string to number so I can preform arithmetic operations.
timeTot=0
timeTmp=$(cat idsOutput | grep 'Run time' | cut -c 36-39)
timeTot=$ #This is line 28
echo "total RunTime=" $timeTot
this is the error msg:
./ids2.sh: line 28: 0+1.35: syntax... (8 Replies)
hello,
i have a variable which should have following content :
var="value1"
or
var="value2"
or
var="value2:*" # example: value2:22
how can i check :
- if the content is ok (value1 / value2* )
- the two options of "value2"
when content is example "value2:22" , i want to split... (3 Replies)
Hi, guys.
In Linux Shell script, how can I check a string whether meets some conditions.
e.g.:
If a string str must start with a underscore or a alphabet, and it must contains at least one lowercase, one uppercase, one numeric and one punctuation, and its length must be more than 8 characters... (2 Replies)
I have below code inside my awk script
if ( $0 ~ /SVC IN:/ )
{
svc_in=substr( $0,23 , 3);
if (msg_start == 1 && msg_end == 0)
{
msg_arr=$0;
}
}
else if ( $0 ~ /^SVC OUT:/ )
{
svc_out=substr( $0, 9, 3);
if (msg_start == 1 && msg_end == 0)
... (6 Replies)
Discussion started by: bhagya123
6 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)