I will be performing a task on several directories, each containing a large number of files (2500+) that follow a regular naming convention:
YYYY_MM_DD_XX.foo_bar.A.B.some_different_stuff.EXT
What I would like to do is automatically discover the part of the filenames that are common to all... (1 Reply)
I have a file with the following format
12g data/datasets/cct 8g data/dataset/cct
10 g data/two 5g data/something_different
10g something_different
5g data/two
is there a way to loop through this... (1 Reply)
Awk Array doesnt match for substring
nawk -F"," 'FNR==NR{a=$2 OFS $3;next} a{print $1,$2,a}' OFS="," file1 file2
I want cluster3 in file1 to match with cluster3int in file2
output getting:
Output required:
Help is appreciated (8 Replies)
Return the position of matched string from right, awk match can do from left only.
e.g return pos 7 for search string "service" from "AA-service"
or return the matched string "service", then caculate the string length.
Thanks!. (3 Replies)
Hi,
I want to find a file / directory with the name xxxxCELLxxx in the given path. The CELL is can be either in a UPPER or lower case.
Thanks (4 Replies)
I am trying to write a command on just one line, i.e seperated by ';' and '|' etc, that finds the number of characters in the longest word of a file, preferably using the 'tr' and 'wc' commands.
i no that wc shows the number of lines words and characters in a file but im not sure how to use it... (5 Replies)
In folder there are files
(eg ABS_18APR2012_XYZ.csv
DSE_17APR2012_ABE.csv) .
My requirement is to delete all the files except today's timestamp
I tried doing this to list all the files not having today's date timestamp
#!/bin/ksh
DATE=`date +"%d%h%Y"`
DIR=/data/rfs/... (9 Replies)
I want to merge the lines by matching substring of the first file with first column of the second file.
file1:
S00739A_ACAGTG_L001_R1.fq.gz
S00739A_ACAGTG_L001_R2.fq.gz
S00739B_GCCAAT_L001_R1.fq.gz
S00739B_GCCAAT_L001_R2.fq.gz
S00739D_GTGAAA_L001_R1.fq.gz
S00739D_GTGAAA_L001_R2.fq.gz... (14 Replies)
hi all,
trying this using shell/bash with sed/awk/grep
I have two files, one containing one column, the other containing multiple columns (comma delimited).
file1.txt
abc12345
def12345
ghi54321
...
file2.txt
abc1,text1,texta
abc,text2,textb
def123,text3,textc
gh,text4,textd... (6 Replies)
Hi,
Let's say I have a pipe-separated input like so:
name_10|A|BCCC|cat_1
name_11|B|DE|cat_2
name_10|A|BC|cat_3
name_11|B|DEEEEEE|cat_4
Using awk, for records with common field 2, I am trying to replace all the shortest substrings by the longest string in field 3.
In order to get the... (5 Replies)
Discussion started by: beca123456
5 Replies
LEARN ABOUT REDHAT
re
re(3pm) Perl Programmers Reference Guide re(3pm)NAME
re - Perl pragma to alter regular expression behaviour
SYNOPSIS
use re 'taint';
($x) = ($^X =~ /^(.*)$/s); # $x is tainted here
$pat = '(?{ $foo = 1 })';
use re 'eval';
/foo${pat}bar/; # won't fail (when not under -T switch)
{
no re 'taint'; # the default
($x) = ($^X =~ /^(.*)$/s); # $x is not tainted here
no re 'eval'; # the default
/foo${pat}bar/; # disallowed (with or without -T switch)
}
use re 'debug'; # NOT lexically scoped (as others are)
/^(.*)$/s; # output debugging info during
# compile and run time
use re 'debugcolor'; # same as 'debug', but with colored output
...
(We use $^X in these examples because it's tainted by default.)
DESCRIPTION
When "use re 'taint'" is in effect, and a tainted string is the target of a regex, the regex memories (or values returned by the m// opera-
tor in list context) are tainted. This feature is useful when regex operations on tainted data aren't meant to extract safe substrings,
but to perform other transformations.
When "use re 'eval'" is in effect, a regex is allowed to contain "(?{ ... })" zero-width assertions even if regular expression contains
variable interpolation. That is normally disallowed, since it is a potential security risk. Note that this pragma is ignored when the
regular expression is obtained from tainted data, i.e. evaluation is always disallowed with tainted regular expresssions. See "(?{ code
})" in perlre.
For the purpose of this pragma, interpolation of precompiled regular expressions (i.e., the result of "qr//") is not considered variable
interpolation. Thus:
/foo${pat}bar/
is allowed if $pat is a precompiled regular expression, even if $pat contains "(?{ ... })" assertions.
When "use re 'debug'" is in effect, perl emits debugging messages when compiling and using regular expressions. The output is the same as
that obtained by running a "-DDEBUGGING"-enabled perl interpreter with the -Dr switch. It may be quite voluminous depending on the complex-
ity of the match. Using "debugcolor" instead of "debug" enables a form of output that can be used to get a colorful display on terminals
that understand termcap color sequences. Set $ENV{PERL_RE_TC} to a comma-separated list of "termcap" properties to use for highlighting
strings on/off, pre-point part on/off. See "Debugging regular expressions" in perldebug for additional info.
The directive "use re 'debug'" is not lexically scoped, as the other directives are. It has both compile-time and run-time effects.
See "Pragmatic Modules" in perlmodlib.
perl v5.8.0 2002-06-01 re(3pm)