I can't seem to find anywhere how to syntactically reference a range of parameters in the script I am trying to write.
My script requires at least 2 parameters to run, with parameter 1 being the main file, which I want appended to x amount of target files, which will be parameters 2 through... (4 Replies)
The script I am writing must be able to run several commands (tar, gzip etc) on filenames that are supplied by variables. I am unsure as to what syntax is required/ideal when referencing variables in filenames. The following is a sample command that I would like the script to execute:
tar cvf... (3 Replies)
Undefined first referenced
symbol in file
std::basic_ostream<char, std::char_traits<char> >::operator<<(int)/var/tmp//ccTR
std::cerr /var/tmp//ccTRcjui.o
std::cout /var/tmp//ccTRcjui.o... (1 Reply)
Hey everyone, I can't figure out this symbol referencing error after looking at it for the longest time, and I figured some fresh eyes might be able to point something out I am overlooking.
Undefined first referenced
symbol in... (1 Reply)
Hi,
I have tried all examples of back referencing from the web but all in vain.
It would be heavily helpful if someone explains me the use of back referencing and sub expression using an example of substitution.
Thanks (1 Reply)
Is it possible to design a shell script to reference something that queries for input?
(This is not to make a script to ssh)
For instance if I have a command that when run, it does something like:
%<Some command>
User's password? Would it be possible to write a script to input something... (1 Reply)
I am referencing variables in the following way
var1="greeting"
greeting="Welcome!"
How do I echo var1 in such a way that it outputs Welcome! ? (3 Replies)
Undefined first referenced
symbol in file
logf /var/tmp//ccwztFsO.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status
float exponC(float mean)
{
index1++;... (1 Reply)
Hi
I have a file which has values in each line:
MP304,d40000
MP310,ff0000
etc
I have another file which as the first value in it and is unique in the file(not repeated). I need to replace a string with the second value above. The second file contents is as follows:(snippet)
<g
... (12 Replies)
Hi experts,
I have multiple file names ending with .jsp located in $SOME_DIR, $SOME_DIR/f1/,$SOME_DIR/f2/test,$SOME_DIR/f3/fa
and there are equivalent class files in $SOME_DIR/WEB-INF/classes/_pages,$SOME_DIR/WEB-INF/classes/_pages/_f1,... (0 Replies)
Discussion started by: oraclermanpt
0 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)