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Shell Programming and Scripting
problem using CAT command in PERL
Post 302432911 by adaleru on Monday 28th of June 2010 12:58:04 AM
06-28-2010
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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
./this is/first/1
./this is/second/2
./this is/third/3
and i am using this file in a for loop with cat command like this
for i in `cat directory.txt`
do
..........
done
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3. UNIX for Advanced & Expert Users
system("cat FILENAME | perl -e 'while(<>) { print $_;}'");
system("cat FILENAME | perl -e 'while(<>) { $_ =~ s/XXX/YYY/g; print $_;}'");
First command works fine but second command gives the following error:
syntax error at -e line 1, near "{ =~"
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4. Shell Programming and Scripting
Hello,
So I sorted my file as I was supposed to:
sort -n -r -k 2 -k 1 file1 | uniq > file2
and when I wrote
> cat file2
in the command line, I got what I was expecting, but in the script itself
...
sort -n -r -k 2 -k 1 averages | uniq > temp
cat file2
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5. UNIX for Dummies Questions & Answers
Hi
I am having a little trouble understanding how to use this cat command. My question is the following:
write a command to create a file called catFiles that contains three copies of the file catFile.
If you can help me to understand how to create this, I would be very greatful.
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6. Shell Programming and Scripting
Hi guys I'm using the following script to change input file format to another format. some where I'm getting the error. Could you please let me know if you find out?
cat input.txt|egrep -v ‘^#'|\ perl -ane ‘if (@F>3){$_=~/(chr.+):(\d+)\ s()/;print $1,”\t”,$2,”\t”,($2+35),”\n”}'\ > output.bed
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7. Shell Programming and Scripting
#!/usr/bin/perl
#use strict;
#use warnings;
my $data = 'node: id=c1, class=nb, cx=100, cy=100, r=10';
#in the above string stored in $data i want to replace = with =" and ',' with "\t
so i used the tr operator as follows
$data =~tr/=/="/s;
print "$data";
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8. Shell Programming and Scripting
I am trying to use the following code:
cat *.txt > OutPutFile.txt
Using files with a expression in one single line that always end with " ; " something like this:
Block1.txt
Block2.txt
Block3.txt
The expected result should be something like this:
OutPutFile.txt:
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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
cat /var/log/Xorg.0.log | grep pixel | sed 's/: 330.*//' |
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:
$ ./ex_01.ksh word1 word2 word3 word4
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 CENTOS
perlqnx
PERLQNX(1) Perl Programmers Reference Guide PERLQNX(1) NAME
perlqnx - Perl version 5 on QNX DESCRIPTION
As of perl5.7.2 all tests pass under: QNX 4.24G Watcom 10.6 with Beta/970211.wcc.update.tar.F socket3r.lib Nov21 1996. As of perl5.8.1 there is at least one test still failing. Some tests may complain under known circumstances. See below and hints/qnx.sh for more information. Under QNX 6.2.0 there are still a few tests which fail. See below and hints/qnx.sh for more information. Required Software for Compiling Perl on QNX4 As with many unix ports, this one depends on a few "standard" unix utilities which are not necessarily standard for QNX4. /bin/sh This is used heavily by Configure and then by perl itself. QNX4's version is fine, but Configure will choke on the 16-bit version, so if you are running QNX 4.22, link /bin/sh to /bin32/ksh ar This is the standard unix library builder. We use wlib. With Watcom 10.6, when wlib is linked as "ar", it behaves like ar and all is fine. Under 9.5, a cover is required. One is included in ../qnx nm This is used (optionally) by configure to list the contents of libraries. I will generate a cover function on the fly in the UU directory. cpp Configure and perl need a way to invoke a C preprocessor. I have created a simple cover for cc which does the right thing. Without this, Configure will create its own wrapper which works, but it doesn't handle some of the command line arguments that perl will throw at it. make You really need GNU make to compile this. GNU make ships by default with QNX 4.23, but you can get it from quics for earlier versions. Outstanding Issues with Perl on QNX4 There is no support for dynamically linked libraries in QNX4. If you wish to compile with the Socket extension, you need to have the TCP/IP toolkit, and you need to make sure that -lsocket locates the correct copy of socket3r.lib. Beware that the Watcom compiler ships with a stub version of socket3r.lib which has very little functionality. Also beware the order in which wlink searches directories for libraries. You may have /usr/lib/socket3r.lib pointing to the correct library, but wlink may pick up /usr/watcom/10.6/usr/lib/socket3r.lib instead. Make sure they both point to the correct library, that is, /usr/tcptk/current/usr/lib/socket3r.lib. The following tests may report errors under QNX4: dist/Cwd/Cwd.t will complain if `pwd` and cwd don't give the same results. cwd calls `fullpath -t`, so if you cd `fullpath -t` before running the test, it will pass. lib/File/Find/taint.t will complain if '.' is in your PATH. The PATH test is triggered because cwd calls `fullpath -t`. ext/IO/lib/IO/t/io_sock.t: Subtests 14 and 22 are skipped due to the fact that the functionality to read back the non-blocking status of a socket is not implemented in QNX's TCP/IP. This has been reported to QNX and it may work with later versions of TCP/IP. t/io/tell.t: Subtest 27 is failing. We are still investigating. QNX auxiliary files The files in the "qnx" directory are: qnx/ar A script that emulates the standard unix archive (aka library) utility. Under Watcom 10.6, ar is linked to wlib and provides the expected interface. With Watcom 9.5, a cover function is required. This one is fairly crude but has proved adequate for compiling perl. qnx/cpp A script that provides C preprocessing functionality. Configure can generate a similar cover, but it doesn't handle all the command- line options that perl throws at it. This might be reasonably placed in /usr/local/bin. Outstanding issues with perl under QNX6 The following tests are still failing for Perl 5.8.1 under QNX 6.2.0: op/sprintf.........................FAILED at test 91 lib/Benchmark......................FAILED at test 26 This is due to a bug in the C library's printf routine. printf("'%e'", 0. ) produces '0.000000e+0', but ANSI requires '0.000000e+00'. QNX has acknowledged the bug. AUTHOR
Norton T. Allen (allen@huarp.harvard.edu) perl v5.16.3 2013-03-04 PERLQNX(1)