Dear friends,
I have one more query,
incase a file contains multiple tags of same name, then how to get the required string between the tags, in which the string begins with "O/M"
i.e., file1.txt contains following text(please note that all the following tags are in single line)... (6 Replies)
I'd like to make a script that I can execute every time I sign on to my linux box that keeps track of the time and allows to me to add a remark to a file. So basically once I log in, I run the script, and it outputs the date and time to a text file (log.txt). But that isn't my problem.
I need... (1 Reply)
Hi,
Need to extract a string from one file and search the same in other files.
Ex:
I have file1 of hundred lines with no delimiters not even space.
I have 3 more files.
I should get 1 to 10 characters say substring from each line of file1 and search that string in rest of the files and get... (1 Reply)
I need to search for a specific string in a file and if this string exist I need to replace it with something else. I am not sure how I could do this, using an if statement. (2 Replies)
Hi all,
I have some data in the form of
adc|nvhs|nahssn|njadnk|nkfds
in the above data i need to write a script so thet it will append "|||" to the third occurnace in the string ..... the outout should look like
adc|nvhs|nahssn||||njadnk|nkfds
Thanks,
Firestar. (6 Replies)
Hi everyone !
suppose i'm searching for a specific string in a file so it is very easy, i use the following command
grep 'keyword' file_name
but how to search a word which is repeated maximum number of times in a file, for example in the following text i have to search a word which is... (12 Replies)
I have a binary (hex) file I need to parse to get some data which are encoded this way:
.* b4 . . . 01 12 .* af .* 83 L1 x1 x2 xL 84 L2 y1 y2 yL
By another words there is a stream of hexadecimal bytes (in my example separated by space for better readability). I need to get value stored in... (3 Replies)
Hi,
For example, I would like to insert a pipe every 4 characters for each second field (including after the last block).
input (coma separated):
line1,AAAABBBBCCCCDDDDEEEE
line2,FFFFGGGGHHHHIIIIJJJJ
output:
line1,AAAA|BBBB|CCCC|DDDD|EEEE|
line2,FFFF|GGGG|HHHH|IIII|JJJJ|
my... (2 Replies)
looks like awk gets confused when there's a % next to a number.
command im running:
awk -F" " '/phxnaz001b/ && /vol/ && NF { if (($NF >= 80) && ($NF < 83)) { print ; print ; w++ } else if ($NF >= 83) { print ; c++ } } END { printf("%d:OK %d:WARNING %d:CRITICAL\n", o, w, c) }' /tmp/test.log
... (3 Replies)
Hi,
I noticed a weird behaviour with awk.
input:
A|B|1-100|blabla_35_40_blabla;blabla_53_60_blabla;blabla_90_110_blabla
Objective:
For each string separated by ';' in $4, if the first and second numbers are included in the interval in $3, then print "TRUE". Otherwise print "FALSE".
In... (3 Replies)
Discussion started by: beca123456
3 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)