What operating system are you using? It is a good idea to always give us this information (and the shell you're using) when you ask for help so we can choose utilities and options that will work in your environment when we make suggestions.
Hello all,
I am being dumb with this and I know there is a simple solution.
I have a file with the follwing lines
bc stuff (more)...............123
bc stuffagain (moretoo)............0
bc stuffyetagain (morehere)......34
failed L3 thing..............1
failed this... (2 Replies)
I tried something like:
set test3 = (4.985e-10 5.130e-10 5.486e-10 6.023e-10 7.015e-10)
set test4 = (4.869e-10 5.010-10 5.363e-10 5.895e-10 6.887e-10)
set test5 = $test3 - $test4
but this doesn't seem to work. And then I tried:
@ test5 = $test3 - $test4
This doesn't seem to work... (8 Replies)
I'm trying to find the longest word in /usr/share/dict/words
The first thing I can think of is to sort the content by length then it would be easy to find out, but then i realize theres no option of sort to sort by length.
Could you guys please give me some help?:confused: (7 Replies)
Hy guys. My English is not so good, sorry for any mistakes.
I'm a bigginer in C, and I have a problem. I want to sort ascending n strings, but I can't read the strings. Here is what I've done so far:
//sort ascending n strings
#include <stdio.h>
int main()
{
int n,i,j;
char a;
... (8 Replies)
Hi to all.
I'm trying to sort this with the Unix command sort.
user1:12345678:3.5:2.5:8:1:2:3
user2:12345679:4.5:3.5:8:1:3:2
user3:12345687:5.5:2.5:6:1:3:2
user4:12345670:5.5:2.5:5:3:2:1
user5:12345671:2.5:5.5:7:2:3:1
I need to get this:
user3:12345687:5.5:2.5:6:1:3:2... (7 Replies)
Hi All,
Sorry to say I have 0 experience writing C++ but have been asked to write a piece of code that will take a double input and an integer for number of decimal places as well as integer for padding and output a string that represents the double formatted (with comma thousand separators -... (2 Replies)
Hello,
okey so my script is using 4 variables that are either empty or numbers in the following format:
NUMBER_1 NUMBER_2 NUMBER_3 NUMBER_4
So they're basically separated by a space and I need to echo the lowest number, so far I've been doing it like this:
echo "2 3 1 3" | tr " "... (6 Replies)
I have files like this:
1
3
4
6
14
3
6
I want to extract the highest number. I have tried using
cat filename | sort
but then 9 would become higher than 14.
So how do I sort? (1 Reply)
How can I sort this, first by 2nd field then by 1st field.
tried sort -b -k 2,2
Input:
AS11 AB1
BD34 AB10
AF12 AC2
A345 AB10
R134 AB2
456 AC10
TTT2 BD12
desired output:
AS11 AB1
R134 AB2
A345 AB10
BD34 AB10
AF12 AC2
456 AC10
TTT2 BD12 (2 Replies)
Discussion started by: aydj
2 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)