Hi,
I have a file like this:
Some_String_Here 123 123 123 321 321 321 3432 3221 557 886 321 321
I would like to find only the unique values in the files and get the following output:
Some_String_Here 123 321 3432 3221 557 886
I am trying to get this done using awk. Can someone please... (5 Replies)
Hi,
I have been dealing with a files only a few gigs until now and was able to get out by using the sort utility. But now, I have a terabyte file which I want to filter out unique values from.
I have a server having 8 processor and 16GB RAM with a 5 TB hdd. Is it worthwhile trying to use... (6 Replies)
After giving
grep -A4 "feature 1," <file name>
I have extracted the following text
feature 1,
subfeat 2,
type 1,
subtype 5,
dump '30352f30312f323030392031313a33303a3337'H -- "05/01/2009 11:30:37" --
--
... (1 Reply)
Hi All,
I am trying to extract data from a large text file , I want to extract lines which contains a five digit number followed by a hyphen , like
12345- , i tried with egrep ,eg : egrep "+" text.txt
but which returns all the lines which contains any number of digits followed by hyhen ,... (19 Replies)
Hi
I have the following info in a file -
<Cell id="25D"/>
<Cell id="26A"/>
<Cell id="26B"/>
<Cell id="26C"/>
<Cell id="27A"/>
<Cell id="27B"/>
<Cell id="27C"/>
<Cell id="28A"/>
I would like to know how would you go about counting all... (4 Replies)
Hi to all,
I got this content/pattern from file http.log.20110808.gz
mail1 httpd: Account Notice: close igchung@abc.com 2011/8/7 7:37:36 0:00:03 0 0 1
mail1 httpd: Account Information: login sastria9@abc.com proxy sid=gFp4DLm5HnU
mail1 httpd: Account Notice: close sastria9@abc.com... (16 Replies)
I need to take the second column of a .csv file and count the number of instances of each unique value in that same second column. I'd like the output to be value,count sorted by most instances. Thanks for any guidance!
Data example:
317476,317756,0
816063,318861,0
313123,319091,0... (4 Replies)
Hi,
I have a file with 20GB Pipe Delimited file where i have too many duplicate records.
I need an awk script to extract the unique records from the file and put it into another file.
Kindly help.
Thanks,
Arun (1 Reply)
Hi Folks,
I have the below feed file named abc1.txt in which you can see there is a title and below is the respective values in the rows and it is completely pipe delimited file ,.
... (4 Replies)
Hello Everyone!
I have updated the first post so that my intentions are easier to understand, and also attached sample files (post #18).
I have over 500 text files in a directory. Over 1 GB of data. The data in those files is organised in lines:
My intention is to return one line per... (23 Replies)
Discussion started by: clippertm
23 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)