10-16-2010
Quote:
Anybody knows the solution with sed
There is no general solution for sed unless the file is sorted. If sorted, the following deletes the duplicate lines:
Quote:
sed '$!N; /^\(.*\)\n\1$/!P; D'
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello,
Can anyone tell Command/Script to remove duplicate lines from the file? (2 Replies)
Discussion started by: Rahulpict
2 Replies
2. Shell Programming and Scripting
I have searched the forum for this - forgive me if I missed a previous post.
I have the following file:
blah blah blah
blah blah blah
blah blah blah
blah blah blah
blah blah blah
alter table "informix".esc_acct add constraint (foreign key (fi_id)
references "informix".fi ... (5 Replies)
Discussion started by: Shoeless_Mike
5 Replies
3. Shell Programming and Scripting
Hi guys,
I need to remove the pattern (ID=180), one line before and four lines after.
Thanks. (5 Replies)
Discussion started by: ashimada
5 Replies
4. Shell Programming and Scripting
Dear All,
I have multiple files having number of records, consist of more than 10 columns some column values are duplicate and i want to remove these duplicate values from these files.
Duplicate values may come in different files.... all files laying in single directory..
Need help to... (3 Replies)
Discussion started by: arvindng
3 Replies
5. Shell Programming and Scripting
Hi,
I came to know that using awk '!x++' removes the duplicate lines. Can anyone please explain the above syntax. I want to understand how the above awk syntax removes the duplicates.
Thanks in advance,
sudvishw :confused: (7 Replies)
Discussion started by: sudvishw
7 Replies
6. Shell Programming and Scripting
Hello again, I am wanting to remove all duplicate blocks of XML code in a file. This is an example:
input:
<string-array name="threeItems">
<item>item1</item>
<item>item2</item>
<item>item3</item>
</string-array>
<string-array name="twoItems">
<item>item1</item>
<item>item2</item>... (19 Replies)
Discussion started by: raidzero
19 Replies
7. Shell Programming and Scripting
Hi,
I have a file with date in it like:
UserString1
UserString2
UserString3
UserString4
UserString5
I need two entries for each line so it reads like
UserString1
UserString1
UserString2
UserString2
etc. Can someone help me with the awk command please?
Thanks (4 Replies)
Discussion started by: Grueben
4 Replies
8. Shell Programming and Scripting
Hi
I know sed and awk has options to give range of line numbers, but
I need to replace pattern in specific lines
Something like
sed -e '1s,14s,26s/pattern/new pattern/' file name
Can somebody help me in this....
I am fine with see/awk/perl
Thank you in advance (9 Replies)
Discussion started by: dani777
9 Replies
9. Shell Programming and Scripting
Greetings All,
I would like to find all occurences of a pattern and delete a substring from the all matching lines EXCEPT the first. For example:
1234::group:user1,user2,user3,blah1,blah2,blah3
2222::othergroup:user9,user8
4444::othergroup2:user3,blah,blah,user1
1234::group3:user5,user1
... (11 Replies)
Discussion started by: jacksolm
11 Replies
10. Shell Programming and Scripting
I create a CGI in bash/html.
My awk script looks like :
echo "<table>"
for fn in /var/www/cgi-bin/LPAR_MAP/*;
do
echo "<td>"
echo "<PRE>"
awk -F',|;' -v test="$test" '
NR==1 {
split(FILENAME ,a,"");
}
$0 ~ test {
if(!header++){
... (12 Replies)
Discussion started by: Tim2424
12 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)