It works, of course, but I would've thought the asterisk modifier, like some other things I tried, would return almost every line. Because if it goes through a line, and comes across a vowel, isn't that an instance of zero times, returning a "true"? Obviously, that's not what happens. I'm just not sure why. One of the ways I tried it, was with a "+" to say "at least one instance."
Also, I didn't think to "cap-off" the expression with a caret and dollar, but now I see why that's necessary.
hello,
i 'd like your help about a bash script which:
1. finds inside the html file (it is attached with my post) the code number of the Latest Stable Kernel,
2.finds the link which leads to the download location of the Latest Stable Kernel version,
(the right link should lead to the file... (3 Replies)
I'm trying to write a programme which scans strings to find how many vowels they contain. I get an error saying that I'm trying to compare a pointer and an integer inif(*v == scanme){. How can I overcome this ? Also, the programme seems to scan only the first word of a string e.g.: if I type "abc... (1 Reply)
Hello,
I am sorry if the title is confusing, but I need a script to grep a list of Names from a Source file in a Master database in which all the homophonic variants of the name are listed along with a single indexing key and store all of these in an output file. I need this because I am testing... (4 Replies)
Hi ,
I need to count the number of errors associated with the two words occurring in the file. It's about counting the occurrences of the word "error" for where is the word "index.js". As such the command should look like. Please kindly help. I was trying: grep "error" log.txt | wc -l (1 Reply)
Hi
I have strings like these :
Vengeance mitt
Men Vengeance gloves
Women Quatro Windstopper Etip gloves
Quatro Windstopper Etip gloves
Girls Thermobite hooded jacket
Thermobite Triclimate snow jacket
Boys Thermobite Triclimate snow jacket
and I would like to get the lower case words at... (2 Replies)
Hello,
I would like to change my setting in a file to the setting that user input.
For example, by default it is
ONBOOT=ON
When user key in "YES", it would be
ONBOOT=YES
--------------
This code only adds in the entire user input, but didn't replace it.
How do i go about... (5 Replies)
hi,
i need to replace all words in any quote position and then need to change the words inside the file thousand of raw.
textfile data :
"Ninguno","Confirma","JuicioABC"
"JuicioCOMP","Recurso","JuicioABC"
"JuicioDELL","Nulidad","Nosino"
"Solidade","JuicioEUR","Segundo"
need... (1 Reply)
Have difficulty to understand this pure C code to only print vowels twice from input string. Questions are commented at the end of each place.
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
/*
*Demonstrate the use of dispatch tables
*/
/*Print a char... (11 Replies)
Hi All,
I need one help to replace particular words in file based on if finds another words in that file .
i.e.
my self is peter@king.
i am staying at north sydney.
we all are peter@king.
How to replace peter to sham if it finds @king in any line of that file.
Please help me... (8 Replies)
Discussion started by: Rajib Podder
8 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)