06-28-2010
What error do you get? And why invoke the cat command at all if Perl is perfectly capable of text processing (hint: it was designed for this)?
Aside from that, your second command doesn't really make sense, as wc either reads from files or from stdin.
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1. UNIX for Advanced & Expert Users
On Solaris 5.8 in ksh,
I have a sample.txt with contents
A 105 305
B 205 405
C 100 198
.......................
when I do a cat sample.txt the O/P is exactly as above but when I do a echo `cat sample.txt` the O/P changes to
A 105 305 B 205 405 C 100 198...........
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2. Shell Programming and Scripting
Hello again;
I have a file in this format
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./this is/second/2
./this is/third/3
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3. UNIX for Advanced & Expert Users
system("cat FILENAME | perl -e 'while(<>) { print $_;}'");
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First command works fine but second command gives the following error:
syntax error at -e line 1, near "{ =~"
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4. Shell Programming and Scripting
Hello,
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...
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5. UNIX for Dummies Questions & Answers
Hi
I am having a little trouble understanding how to use this cat command. My question is the following:
write a command to create a file called catFiles that contains three copies of the file catFile.
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6. Shell Programming and Scripting
Hi guys I'm using the following script to change input file format to another format. some where I'm getting the error. Could you please let me know if you find out?
cat input.txt|egrep -v ‘^#'|\ perl -ane ‘if (@F>3){$_=~/(chr.+):(\d+)\ s()/;print $1,”\t”,$2,”\t”,($2+35),”\n”}'\ > output.bed
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#!/usr/bin/perl
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Hi All
i need a little script that can open a file , read it and then spit out some information from it
from the shell i would do
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how can i do this nicley in perl
thanks
Adam (3 Replies)
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10. Shell Programming and Scripting
Hey all this is probably something simple but not sure why I am getting this error. Any help is appreciated.
Expected output:
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arguments: word1 word2 word3 word4
Number of arguments: 4
what I am getting:
./ex_01.ksh word1 word2 word3 word4
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LEARN ABOUT DEBIAN
pegasus-invoke
PEGASUS-INVOKE(1) PEGASUS-INVOKE(1)
NAME
pegasus-invoke - invokes a command from a file
SYNOPSIS
pegasus-invoke ( app | @fn ) [ arg | *@fn [..]]
DESCRIPTION
The pegasus-invoke tool invokes a single application with as many arguments as your Unix permits (128k characters for Linux). Arguments are
come from two places, either the command-line as regular arguments, or from a special file, which contains one argument per line.
The pegasus-invoke tool became necessary to work around the 4k argument length limit in Condor. It also permits to use arguments inside
argument files without worry about shell, Condor or Globus escape necessities. All argument file contents are passed as is, one line per
argument entry.
ARGUMENTS
-d
This option increases the debug level. Currently, only debugging or no debugging is distinguished. Debug message are generated on
stdout . By default, debugging is disabled.
-h
This option prints the help message and exits the program.
--
This option stops any option processing. It may only be necessary, if the application is stated on the command-line, and starts with a
hyphen itself.The first argument must either be the application to run as fully-specified location (either absolute, or relative to
current wd), or a file containing one argument per line. The PATH environment variables is not used to locate an application.
Subsequent arguments may either be specified explicitely on the commandline. Any argument that starts with an at (@) sign is taken to
introduce a filename, which contains one argument per line. The textual file may contain long arguments and filenames. However, Unices
still impose limits on the maximum length of a directory name, and the maximum length of a file name. These lengths are not checked,
because pegasus-invoke is oblivious of the application (e.g. what argument is a filename, and what argument is a mere string resembling
a filename).
RETURN VALUE
The pegasus-invoke tool returns 127, if it was unable to find the application. It returns 126, if there was a problem parsing the file. All
other exit status, including 126 and 127, come from the application.
SEE ALSO
pegasus-kickstart(1)
EXAMPLE
$ echo "/bin/date" > X
$ echo "-Isec" >> X
$ pegasus-invoke @X
2005-11-03T15:07:01-0600
Recursion is also possible. Please mind not to use circular inclusions. Also note how duplicating the initial at (@) sign will escape its
meaning as inclusion symbol.
$ cat test.3
This is test 3
$ cat test.2
/bin/echo
@test.3
@@test.3
$ pegasus-invoke @test.2
This is test 3 @test.3
RESTRICTIONS
While the arguments themselves may contain files with arguments to parse, starting with an at (@) sign as before, the maximum recursion
limit is 32 levels of inclusions. It is not possible (yet) to use stdin as source of inclusion.
HISTORY
As you may have noticed, pegasus-invoke had the name invoke in previous incantations. We are slowly moving to the new name to avoid clashes
in a larger OS installation setting. However, there is no pertinent need to change the internal name, too, as no name clashes are expected.
AUTHORS
Mike Wilde <wilde at mcs dot anl dot gov>
Jens-S. Vockler <voeckler at isi dot edu>
Pegasus http://pegasus.isi.edu/
05/24/2012 PEGASUS-INVOKE(1)