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how to include a text pattern in system function in PERL

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# 1  
Old 08-23-2012
CPU & Memory how to include a text pattern in system function in PERL
Pleeeeease help..

I'm working in perl

i have a system function to check whether a file is readable for others or not.

i just want to print a text in that command

my command is :

Code:
system ("ls -la $filename | awk '\$1~ /^-......r../ {print \$9}'");


i know for displaying text in awk command one needs to put it in double quotes "" but here how to do that.. when we are executing awk in system command (which already has double quotes in the start and end)


Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. You already got a PM for that for your last posts, do not ignore that. Else you will start collecting infraction points.
Last edited by zaxxon; 08-23-2012 at 04:17 AM.. Reason: code tags
# 2  
Old 08-23-2012
Quote:
Originally Posted by shubhamsachdeva
i have a system function to check whether a file is readable for others or not.
my command is :
Code:
system ("ls -la $filename | awk '\$1~ /^-......r../ {print \$9}'");

Perl has file tests too, you know. You can do this to check if a file is readable or not!

Code:
if ( -r "/path/to/file.txt" ) {
    print "Yes, readable.\n";
}

# 3  
Old 08-23-2012
if (-r ) would display the print output if the file is readable for the user.

i need to check it for others.

E.g.

-rw--rw-r--

it means its :-

readable and writable for user
readable and writable for group
and only readable other

so.. i need it for others
# 4  
Old 08-23-2012
As i said in the another thread, you need to check stat

https://www.unix.com/shell-programmin...on-others.html
# 5  
Old 08-23-2012
its not helping

when i write stat file.txt on the command terminal the file statistics appear.

but when i write this in a perl script .. output doesn't appear

i anyway have to use

system (stat file.txt)

then it appear


but again difficulties are there in system command to print a string
# 6  
Old 08-23-2012
Indeed it is helping a lot.

If you would have checked the link itkamaraj posted correctly, you would have seen this example, which has just been changed by the shebang and a variable $filename:
Code:
$ cat mach.pl
#!/usr/bin/perl
$filename = "./infile";
$mode = (stat($filename))[2];
printf "Permissions are %04o\n", $mode & 07777;

It produces:
Code:
$ ls -la infile
-rw-r--r-- 1 root root 0 23. Aug 11:12 infile
$ ./mach.pl
Permissions are 0644

# 7  
Old 08-23-2012
Code:
#!/usr/bin/perl -w
$file="input.txt";
$mode = sprintf '%04o', (stat $file)[2] & 07777;
print "Permissions are $mode\n";

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