I couldn't tell from your code whether the filenames had the suffix tacked onto the end (picture.jpgxxxx) or picture.xxxx.jpg. The ls command implies the latter, but you seem to be stripping off xxxx as the trailing 4 characters. You might be getting tripped up with this too. If you post a sample of filenames and a sample of your text file, it'd make giving suggestions a bit easier.
They were more like this (a current example right from the "victim" directory):
Code:
gae72-7201-077-005biki.jpg
My rename script, which I run once these have been annotated according to the four letters preceding the ".", chops off that four-letter substring with what you saw in my script in this thread as the 'puregrain' variable (in the other script, it's an m.)
Quote:
Nitpicking now.... the statement
Code:
souse=$(echo $line)
can be written more simply:
Code:
souse="$line"
This is easier to read, and depending on the shell it more efficient. There might also be ways to make sussing the field data from the text file more efficient; using external processes like 'cut' introduce overhead that can eat your lunch as far as performance is concerned.
I asked about performance and efficiency in simplification on one thread I started over on the LQ forum. The person there who was giving me advice (and has done so, before and since) was rather vague about it. If it's a shell-by-shell or build/version-by-build/version thing, I understand why now. Trial and error -- don't mind it so long as my bash will still fork commands in the morning
I have a file that lists data about a system. It has a part that can look like:
the errors I'm looking for with other errors:
Alerts
Password Incorrect
Login Error
Another Error
Another Error 2
Other Info
or, just the errors I need to parse for:
Alerts
Password Incorrect
... (9 Replies)
For a field format such as AAL1001_MD82, how do I select(and use in if statement) only the last four elements( in this case MD82) or the first three elements (in this case AAL)?
For instance, how do I do the following - if first three elements of $x == yyy, then ... (5 Replies)
i have a variable MYHOST that has my host name.depending on the host i have an array like A_<hostname>.Everytime i need to append the hostname to A_ to get the array.but in the shell script i am nt able to access the members of that array.
code of what i hav done:
export temp=A_$MYHOST
for... (15 Replies)
Hi there,
I have included an external properties file into my BASH script via the 'source' command.
I am attempting to dynamically assign a variable in the BASH script, that references the variable name within the external properties file i.e.
#!/bin/bash
pth=${0%/*}
source... (3 Replies)
Hello All,
I am having this issue...where I am actually having hard time understanding the problem:
The code is as follows:
#include<iostream.h>
void fxn(char*** var)
{
int i =4;
*var = (char**)malloc(i*sizeof(char*));
for(int j =0; j<4; j++)
{
*var = "name";
cout<<*var;... (6 Replies)
Here is the question...
Create a new script, sub2, taking three parameters...
1.) the string to be replaced
2.) the string with which to replace it
3.) the name of the file in which to make the substitution
...that treats the string to be replaced as plain text instead of as a regular... (1 Reply)
Dear all,
I believe this is a Bash basic question... I am bit ashamed for asking actually...
I want to create a Bash script that compares 2 different folders:
1) work_folder
and
2) work_folder.git
#!/bin/bash
FOLDER_NAME=`pwd | awk -F/ '{ print $NF }' | awk -F. '{ print $1 }'`
... (6 Replies)
Discussion started by: freddie50
6 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)
08-02-2010
