08-30-2006
One more question
Thanks Vgresh. One more question please.
What does
Quote:
[^_] represent in the code
?
^ signifies starting of the line. But what does _ represent?
I appreciate your reply.
Thanks friend.
10 More Discussions You Might Find Interesting
1. Programming
Can anyone help me?????
My problem is that i want to read only one charcter from keyboard. Each time my program waits to press enter or ^d. I don't want that. As soon as i press a charcter it should proceed to next statement in program without pressing enter or ^d.
please help... (3 Replies)
Discussion started by: alodha
3 Replies
2. Shell Programming and Scripting
Could someone tell me the single character wildcard for SED?
I have the file below:
$ more input2
AAA /A/B/C BBB /D/E/F
CCC /G/H/I DDD
I want to remove all strings which contain forward slashs "/" to get the below:
AAA BBB
CCC
I tried to do it in SED by the command below but I... (8 Replies)
Discussion started by: stevefox
8 Replies
3. UNIX for Dummies Questions & Answers
Here is a sample code
grep '903' -i user.txt | tail -2 | awk '{print $2}' | sed 's/B//g'
the input file has data as such
903-xxx-xxxxB
903-xxx-xxxxB
It is a dialer file i want to remove the "B"
any help thanks (5 Replies)
Discussion started by: Iz3k34l
5 Replies
4. UNIX for Dummies Questions & Answers
Using UNIX tools, but not using GAWK (NAWK is OK), is there a more elegant way to achieve this:
sed '
s/_a/_A/1
s/_b/_B/1
s/_c/_C/1
rest of alpahabet
'
I want to change the case of a single character in each string of a text file. The character will be matched by regex '_' and only... (2 Replies)
Discussion started by: uiop44
2 Replies
5. Shell Programming and Scripting
Hi all,
Greetings,
I have the following scenario, The contents of main file are like :
Unix|||||forum|||||||||||||||is||||||the||best
so||||||be|||||on||||||||||||||||||||||||||||||||||||||||||||it
And i need the output in the following form:
Unix=forum=is=the=best
so=be=on=it
... (3 Replies)
Discussion started by: dipanchandra
3 Replies
6. Shell Programming and Scripting
Hi
Does anyone know how to set any character as the field separator with awk/nawk on a solaris 10 box. I have tried using /./ regex but this doesnt work either and im out of ideas.
thanks (7 Replies)
Discussion started by: chronics
7 Replies
7. UNIX for Dummies Questions & Answers
Hi
I normally use backspace to delete a single on my local machine in cygwin. Now I am trying cygwin on a virtual machine and when I type 'backspace', instead of a single character being deleted, the entire word gets deleted.
How do I change the settings for it?
I read somewhere that I... (2 Replies)
Discussion started by: ladyAnne
2 Replies
8. Programming
Dear Mates,
I am trying to write a macro to replace with its arguments with singles quotes around each argument.
#define DECR(a,b,c,d,e) decr('a','b','c','d','e')
if the usage is
DECR(k,e,y,s,\0)
I want it to be replaced with the following
decr('k','e','y','s','\0')
However it... (2 Replies)
Discussion started by: tamil.pamaran
2 Replies
9. Shell Programming and Scripting
I need to check whether first character of variable is single quote.
I tried the below constructions but they are all not working (always return true)
if (test `echo "$REGEXP" |cut -c1` != "'"); then echo "TRUE"; fi
if (test `echo "$REGEXP" |cut -c1` != '\''); then echo "TRUE"; fi
if (test... (5 Replies)
Discussion started by: urello
5 Replies
10. Shell Programming and Scripting
I have a csv dataset like this :
C,rs18768
G,rs13785
GA,rs1065
G,rs1801279
T,rs9274407
A,rs730012
I'm thinking of use like awk, sed to covert the dataset to this format: (if it's two character, then keep the same)
CC,rs18768
GG,rs13785
GA,rs1065
GG,rs1801279
TT,rs9274407... (7 Replies)
Discussion started by: nengcheng
7 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)