Reading lines in a file matching a pattern

torenji · #1 (**permalink**) 10-24-2007

Hi,

I need to redirect the lines in a file to a different file if the character starting from 2 to 6 in the line are numerical [0-9].

Please let me know if anyone have any script to do this.

Thanks,
Ranjit

jim mcnamara · #2 (**permalink**) 10-24-2007

Can you give us an example set of the lines of the file.

summer_cherry · #3 (**permalink**) 10-24-2007

Hi,

First of all, i would like to give you a suggestion that while you are here. try to give a example about your thread. Then it will be easy for others to understand your requirements and give you the suitable solution.

I assume your requirements as follow:

input:

Code:

a23456 line is the first line
abcd line is the second line
12345644 line is the third line
sadfjkl line is the forth line

output ( content in another file):

Code:

a23456 line is the first line
12345644 line is the third line

code:
awk '{
if (substr($0,2,5)+0==substr($0,2,5))
print
}' firstfile > secondfile

ghostdog74 · #4 (**permalink**) 10-25-2007

using same example

Code:

# awk 'substr($0,2,5) ~ /[0-9]+/' "file"
a23456 line is the first line
12345644 line is the third line

Yogesh Sawant · #5 (**permalink**) 10-25-2007

using Perl:

Code:

#!/usr/bin/perl
# extract_num_lines.pl
while (<>) {
    print if (m/^.\d{5}/);
}

Run this script as:

Code:

perl extract_num_lines.pl num_file > new_file

^ represents start of line
. represents a single character
\d represents a digit
\d{5} represent exactly five digits

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