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how to include slashes "/" in @ARGV (Perl)

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Top Forums Shell Programming and Scripting how to include slashes "/" in @ARGV (Perl)
# 1  
Old 01-29-2006
how to include slashes "/" in @ARGV (Perl)
Hello
I have simple script that will accept as arg string like this :

".../foo/blah/,.../.../foo1/,.../blah"

now perl automatically removes the slashes "/" , I can't escape the slashes in the input I have to control on it
so how can I force perl to not touch this slashes?


Thanks
allot
# 2  
Old 01-30-2006
I haven't heard about Perl removing slashes from anything passed into @ARGV.

In particular, I performed this test (on a Windows machine right now, but I guess this is true for *nix as well):

Code:
D:\Documents and Settings\bernardchan>perl -e "print $ARGV[0]" "a/b/c/d"
a/b/c/d

Maybe the shell or some other intermediate programs are the culprit?
# 3  
Old 01-30-2006
let me show you what i mean
Hello i ahev this simple simple script that gets input and print input :
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#!/usr/bin/perl

$libs = @ARGV[0];
print "\n$libs \n";
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++

im excutinng the script as this :

myscript.pl ..\blah,..\..\..\blahq,..\..\..\..\..\blah\blah\blah,..\..\..\..\..\blah11\bo,..\..\..\..\..\Librari es\Include\foo,..\..\..\..\..\foo\foo1\fo2\fo3,

and the print output is :

..blah,......blahq,..........blah\blah\blah,..........blah11bo,..........LibrariesIncludefoo,....... ...foofoo1fo2fo3,

as you see all the slashes are gone
how can i avoid this ?

thanks
# 4  
Old 01-30-2006
I knew what you meant. As I said, obviously it is the shell, not Perl, that is eating the backslashes.

Code:
cbkihong@cbkihong:~$ perl -e 'print $ARGV[0] . "\n"' '..\b\v\d'
..\b\v\d
cbkihong@cbkihong:~$ perl -e 'print $ARGV[0] . "\n"' ..\b\v\d
..bvd
cbkihong@cbkihong:~$ perl -e 'print $ARGV[0] . "\n"' ..\\b\\v\\d
..\b\v\d

If you feel more comfortable looking at your own example:

Quote:
cbkihong@cbkihong:~$ /dev/shm/test.pl ..\blah,..\..\..\blahq,..\..\..\..\..\blah\blah\blah,..\..\..\..\..\blah11\bo,..\..\..\..\..\Librari es\Include\foo,..\..\..\..\..\foo\foo1\fo2\fo3,

..blah,......blahq,..........blahblahblah,..........blah11bo,..........Librari
cbkihong@cbkihong:~$ /dev/shm/test.pl '..\blah,..\..\..\blahq,..\..\..\..\..\blah\blah\blah,..\..\..\..\..\blah11\bo,..\..\..\..\..\Librar i es\Include\foo,..\..\..\..\..\foo\foo1\fo2\fo3,'

..\blah,..\..\..\blahq,..\..\..\..\..\blah\blah\blah,..\..\..\..\..\blah11\bo,..\..\..\..\..\Librari es\Include\foo,..\..\..\..\..\foo\foo1\fo2\fo3,
Even though you said you cannot control the controlling process, but actually it is that process that has made an incorrect assumption that parameters need not be quoted, but the fact is special characters are treated specially by the shell.

For instance, the bash manpage has this:

Quote:
There are three quoting mechanisms: the escape character, single quotes, and double quotes.

A non-quoted backslash (\) is the escape character. It preserves the literal value of the next character that follows, with the exception of <newline>. If a \<newline> pair appears, and the backslash is not itself quoted, the \<newline> is treated as a line continuation (that is, it is removed from the input stream and effectively ignored).

Enclosing characters in single quotes preserves the literal value of each character within the quotes. A single quote may not occur between single quotes, even when preceded by a backslash.

Enclosing characters in double quotes preserves the literal value of all characters within the quotes, with the exception of $, `, \, and, when history expansion is enabled, !. The characters $ and ` retain their special meaning within double quotes. The backslash retains its special meaning only when followed by one of the following characters: $, `, " , \, or <newline>. A double quote may be quoted within double quotes by preceding it with a backslash. If enabled, history expansion will be performed unless an ! appearing in double quotes is escaped using a backslash. The backslash preceding the ! is not removed.
So you have no option but to teach the process that generates the command to quote the parameters or escape the offending characters (\ $ etc.), because the backslashes have already been gone by the time they reach Perl. Perl has no way of getting them back!
# 5  
Old 04-07-2009
ARGV how to enter "/db2qdir1/scripts/db2" as input
I want to execute a perl program that has an argument like this:
sys_db2actp_runstats_AUTOSYS.pl "/db2qdir1/scripts/db2" db2actq EMLNK_DB
in UNIX. It doesn't accept the /db2qdir1/scripts/db2 argument. I have tried enclosing with double quotes, single quotes, tick marks "`", and no quotes. What am I doing wrong ?
# 6  
Old 04-07-2009
Quote:
Originally Posted by jimpalla
What am I doing wrong ?
You're posting a new question onto the end of a 3 year old thread. Smilie
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