11-08-2019
Quote:
Originally Posted by
Scrutinizer
Use the tolower(str) function to changes strings to lowercase where appropriate to make it case insensitive...
Sorry where i need to use this code
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I've got a bunch of files called oldabc, olddef etc.
i want to copy these to be abc, def....
I can do this with file extensions....but can get the logic to work for prefixes. All the files I am interested in have a prefix of 'old'.
This loop is no good for me....it looks at the content... (2 Replies)
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2. Shell Programming and Scripting
Hi
Input File:
export NAME='AA.BB.CC'
export FILE=1.2.3
AA.BB.CC
export MAIL= '1.3.3'
export char='XX.YY.ZZ'
Out File
export NAME='AA/BB/CC'
export FILE=1.2.3
AA.BB.CC
export MAIL= '1.3.3'
export char='XX/YY/ZZ'
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Hi,
I have a variable, which contains comma separated values. Something like.
StringA="abc,def,ghi,jkl"
I want to apply prefix and suffix to each value in the string without using any loops.
Say if Prefix is Pre_ and Suffix is _Suf then I need to get
... (1 Reply)
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I have a file:
chromosome1:436728
chromosome2:32892
.....
chromosome22:23781
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OK, now I just feel plain silly asking this. But I am very much a beginner at compiling and installing Unix software, so...
When setting the prefix, do you also have to specify the directory the files reside in? For example, lets say I am installing cURL in /usr/local
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In unix when I run rm command, it asks for file removal confirmation e.g.
rm netmail_log.csv
rm: remove netmail_log.csv (yes/no)? n
But if i prefix backslash to rm it does not ask for confirmation. Does anyone know what backslash does to command or shell ?
e.g.
\rm netmail_log.csv (1 Reply)
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Hi,
I have a directory with Multiple subdirectories and 1000s of pictures (jpg) in each directory. The problem is that each directory has a 001.jpg in them. I want to append a unique name (the directory_name)would be fine. and then move them to one main backup directory once they have been... (1 Reply)
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Hello everyone,
I want to remove only prefix ME_ from all the values that are present in the FILEA. Below code I'm using for this.
sed 's/ME\_//g' FILEA > FILEB
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Dear All,
assume i have a file with content:
<Start>6000</Start>
<Stop>7599</Stop>
the output is:
6000
7000
7100
7200
7300
7400
7599
how should we use any awk, sed, perl can do this task, means to extract the uniq prefixes from the start and stop prefix.
Thanks
Jimmy (3 Replies)
Discussion started by: jimmy_y
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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)