Hi , I am having a script which will start a process and appends the process related logs to a log file. The log file writes logs with every line starting with date in the format of: date +"%Y %b %d %H:%M:%S".
So, in the script, before I start the process, I am storing the date as DATE=`date +"%Y... (5 Replies)
I am new to Unix so will really appreciate if someone can guide me on this.
What I want to do is:
Step1: Read binary file - pick first 2 bytes, convert from hex to decimal. Read the next 3 bytes as well.
2 bytes will specify the number of bytes 'n' that I want to read and write... (1 Reply)
Hi,
I am working in device drivers. I am new to device drivers. i have invoked chardev.c.
the driver is insmoded. now i want to write something into this and i want to look what i have written. but i don't know how to write and see. please help me (0 Replies)
I have a text file called (msgz ) contains data :
Subscriber
Data ID = 2
Customer = 99
Data ID = 4
Customer = cf99
Data ID = 5
Customer = c99
Data ID = 11
Customer = 9n9
Subscriber
Data ID = 1
Customer = 9ds9
Data ID = 2
Customer = 9sad9
Data ID = 3
Customer = f99... (3 Replies)
I have list of files in a directory 'dir'. Each file is of type HTML. I need to read each file and get the string which starts with 'http' and write them in a new text file. How can i do this shell scripting?
file1.html
<head>
<url>http://www.google.com</url>
</head>
file2.html
<head>... (6 Replies)
Hello,
I need to do one thing that my script creates the file
touch release.SPLASH_12_03_00_RC01.txt
Now I want to update that file with some content e.g
splashbuild::SPLASH_12_17_00_RC02.zip
Thanks (1 Reply)
dear all,
i need your advice
i have sample script like this:
testing.sh
for i in {1..10}
do
echo testing $i
done
but i forgot create "#!/bin/bash" in above "for"
so i want output will like this
testing.sh
#!/bin/bash
for i in {1..10}
do
echo testing $i
done (2 Replies)
hi..i would ask about how to write over data to new file with BASH.
so..assume my data looks like this :
11
12
13
14
15
...and so on. It's always line by line. and that's for the first file.
i want to write over those numbers into second file but by using space. so my second file should be... (5 Replies)
Hi,
I need to compare 2 text files with around 60000 rows and 1 column. I need to compare these and write the mismatch data to 3rd file.
File1 - file2 = file3
wc -l file1.txt
58112
wc -l file2.txt
55260
head -5 file1.txt
101214200123
101214700300
101250030067
101214100500... (10 Replies)
Discussion started by: Divya Nochiyil
10 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)