Perl: combine Backtick & system() I/O operation? Post: 302425827

Sponsored Content

Top Forums Shell Programming and Scripting Perl: combine Backtick & system() I/O operation? Post 302425827 by durden_tyler on Sunday 30th of May 2010 03:07:48 PM

05-30-2010

Registered User

No, that second argument is either a filename or an array of filenames to which the output of command ("dir") would be redirected.

Code:

$ # print the output of "dir" on the screen
$ # and also redirect the output of "dir" to the file "file1.out"
$ perl -le 'use Tee; tee("dir", "file1.out")'
testfile  testfile.out
$ 
$ # check the content of the file "file1.out" now
$ cat file1.out
testfile  testfile.out
$ 
$ # the same as what was printed on the screen

Same thing with an array of filenames:

Code:

$ 
$ # print the output of "dir" on the screen
$ # and also redirect the output of "dir" to the files in the array
$ # "@files" i.e. file2.out, file3.out and file4.out
$ perl -le 'use Tee; @files = qw (file2.out file3.out file4.out); tee("dir", @files)'
file1.out  testfile  testfile.out
$ 
$ # now check the contents of file2.out, file3.out and file4.out
$ cat file2.out
file1.out  testfile  testfile.out
$ 
$ cat file3.out
file1.out  testfile  testfile.out
$ 
$ cat file4.out
file1.out  testfile  testfile.out
$ 
$

tyler_durden

durden_tyler

View Public Profile for durden_tyler

Find all posts by durden_tyler

10 More Discussions You Might Find Interesting

1. UNIX Desktop Questions & Answers

Multi operation system in one pc.

Does anyone can write a thread to teach me how to install Windows 2000, RH Linux, and FreeBSD unix in one machine step by step? Or someone's already done with this topic?

2. Ubuntu

where can i get the unix operation system?

I am a stranger here ,where can i get the operation for free.thank you!

3. UNIX for Dummies Questions & Answers

what does the operation '>&' mean in a shell script

hi, all, i saw a syntax like this usr/local/mpiexec -np 8 /home/XXXX/program_exe >& ./temp/out the output will be put into ./temp/out. I want to know the meaning of the operation symbol '>&'. Thanks

4. Shell Programming and Scripting

combine two perl lines into a single perl command

Hi Everyone, i have a string 00:44:40 so: $tmp=~ s/://gi; $tmp=~s/({2})({2})({2})/$1*3600+$2*60+$3/e; the output is 2680. Any way to combine this two lines into a single line? Thanks

5. Shell Programming and Scripting

Perl: Backtick Errors

When trying to use backticks for system commands, is there a way to read the error messages if a command doesn't execute properly? I have no problem getting the results if the command is properly executed. Ex. my @result = `dir`; foreach my $line (@result) { print "Result = $line";...

6. Linux

commands of linux operation system

Am actually am new to the linux operating system and knda wana knw more about it.Please could u help me with some commands so i can start with that first.Really need your help

7. UNIX for Dummies Questions & Answers

system calls and atomic operation

Are system calls atomic operations? Is a system call can be interrupted?

8. Shell Programming and Scripting

Enter third column & Perform Operation

I am trying to enter a third column in this file, but the third column should that I call "Math" perform a some math calculations based on the value found in column #2. Here is the input file: Here is the desired output: Output GERk0203078$ Levir Math Cotete_1...

9. AIX

Monitoring AIX with System Center Operation Manager 2007 R2

I can get my AIX servers to show up in SCOM but I'm struggling with running personal scripts and have the result of these scripts show up in SCOM. I'm currently using BigBrother and I've written some scripts for BB. I would like to convert these scripts to something that can be used in SCOM. ...

10. Shell Programming and Scripting

Help me to perform count & group by operation in shell scripting?

Hi All, I want to display the distinct values in the file and for each distinct value how may occurance or there. Test data: test1.dat 20121105 20121105 20121105 20121105 20121106 20121106 20121106 20121105 I need to display the output like Output

LEARN ABOUT REDHAT

merge

MERGE(1)						      General Commands Manual							  MERGE(1)

NAME

       merge - three-way file merge

SYNOPSIS

       merge [ options ] file1 file2 file3

DESCRIPTION

       merge  incorporates all changes that lead from file2 to file3 into file1.  The result ordinarily goes into file1.  merge is useful for com-
       bining separate changes to an original.	Suppose file2 is the original, and both file1 and file3 are modifications of  file2.   Then  merge
       combines both changes.

       A  conflict  occurs  if	both  file1 and file3 have changes in a common segment of lines.  If a conflict is found, merge normally outputs a
       warning and brackets the conflict with <<<<<<< and >>>>>>> lines.  A typical conflict will look like this:

	      <<<<<<< file A
	      lines in file A
	      =======
	      lines in file B
	      >>>>>>> file B

       If there are conflicts, the user should edit the result and delete one of the alternatives.

OPTIONS

       -A     Output conflicts using the -A style of diff3(1), if supported by diff3.  This merges all changes leading from file2  to  file3  into
	      file1, and generates the most verbose output.

       -E, -e These  options  specify conflict styles that generate less information than -A.  See diff3(1) for details.  The default is -E.  With
	      -e, merge does not warn about conflicts.

       -L label
	      This option may be given up to three times, and specifies labels to be used in place of the corresponding  file  names  in  conflict
	      reports.	 That  is, merge -L x -L y -L z a b c generates output that looks like it came from files x, y and z instead of from files
	      a, b and c.

       -p     Send results to standard output instead of overwriting file1.

       -q     Quiet; do not warn about conflicts.  -V Print 's version number.

DIAGNOSTICS

       Exit status is 0 for no conflicts, 1 for some conflicts, 2 for trouble.

IDENTIFICATION

       Author: Walter F. Tichy.
       Manual Page Revision: 5.7; Release Date: 1995/06/01.
       Copyright (C) 1982, 1988, 1989 Walter F. Tichy.
       Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert.

SEE ALSO

       diff3(1), diff(1), rcsmerge(1), co(1).

BUGS

       It normally does not make sense to merge binary files as if they were text, but merge tries to do it anyway.

GNU
								    1995/06/01								  MERGE(1)

10 More Discussions You Might Find Interesting

1. UNIX Desktop Questions & Answers

Multi operation system in one pc.

Discussion started by: HOUSCOUS

2. Ubuntu

where can i get the unix operation system?

Discussion started by: tcb3210

3. UNIX for Dummies Questions & Answers

what does the operation '>&' mean in a shell script

Discussion started by: cy163

4. Shell Programming and Scripting

combine two perl lines into a single perl command

Discussion started by: jimmy_y