You probably mean:
On many modern versions of "find" the "+" syntax is actually fastest of all:
Addendum:
Quote:
ls * | wc –w => this gives you the number of files in the current directory including all subdirectories
Sort of true. It does however exclude filenames starting with a period (e.g. .profile). It also sorts each directory to alphabetical order which is a bit of a waste if all you wanted to do was count them. It also gives an incorrect count if any filename contains a space character because you are counting "words". You also count directory files but because "including all subdirectories" is ambiguous it's hard to tell whether this is intentional.
Hi, I need a script that loops through all the files two directories
passed to it via parameter, and if two files have the same name, do a
cmp comparison on the files. If the files are different, output the
specifics returned by cmp. What's the best way to go about writing
this, as I am a... (6 Replies)
Say for example I have a list of numbers..
5
10
13
48
1
could I use grep to show only those numbers that are above 10? For various reasons I can only use grep... not awk or sed etc. (7 Replies)
I have two files.And a sort of matrix analysis.
Both files have a string followed by two numbers:
File 1:
A 2 7
B 3 11
C 5 10
......
File 2:
X 1 10
Y 3 5
Z 5 9
What I'd like to do is for each set of numbers in the second file indicate if the first or second number (or both) in... (7 Replies)
So, I have no formal higher education in programming at all and am self taught. I am now wondering what would be considered best practices? Like should I hard code a variable, then compare it to what I want to know or achieve, or should I just put the commands with in the brackets?
Example, a... (5 Replies)
Can someone please tell me what is wrong with this stings comparison?
#!/bin/sh
#set -xv
set -u
VAR=$(ping -c 5 -w 10 google.com | grep icmp_req=5 | awk '{print $6}')
echo I like cookies
echo $VAR
if "$VAR" == 'icmp_req=5'
then
echo You Rock
else
echo You Stink
fiThis is the error.... (6 Replies)
Hi,
I want to perform a simple date comparisons, i.e. select all files modified after a certain date (say 12-feb-2011)
I do not have the option of creating a file and using find's -newer option.
Any simple way to do this? I can do this by reading the stat command's output and comparing... (10 Replies)
I'd love to get help on this one please. Ok so say I have a file called README with lines such as this:
index:index.html
required:file1.1:file2.1:file3.1
I'm having trouble with writing an if statement that compares the items in a list with a file inside README, what I imagine in my head... (7 Replies)
Hi,
I have 25 groups and I need to perform all possible pairwise compariosns between them using the formula n(n-1)/2. SO in my case it will be 25(25-1)/2 which is equal to 300 comparisons.
my 25 groups are
FG1 FG2 FG3 FG4 FG5
NT5E CD44 CD44 CD44 AXL
ADAM19 CCDC80 L1CAM L1CAM CD44... (1 Reply)
Hi all,
I want to compare two files based on column value
Kindly help me
a.txt
123,ABCD
456,DEF
789,SDF
b.txt
123,KJI
456,LMN
321,MJK
678,KOL
Output file should be like
Common on both files
c.txt
123,ABCD,KJI (8 Replies)
Here is the sample code:
str1="abccccc"
str2="abc?"
if ]; then
echo "same string"
else
echo "different string"
fi
Given that ? implies 0 or 1 match of preceding character, I was expecting the output to be "different string", but I am seeing "same string".
Am I not using the... (3 Replies)
Discussion started by: Rameshck
3 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)