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Reading lines in a file matching a pattern

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# 1  
Old 10-24-2007
Reading lines in a file matching a pattern
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
# 2  
Old 10-24-2007
Can you give us an example set of the lines of the file.
# 3  
Old 10-25-2007
awk
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
# 4  
Old 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

# 5  
Old 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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