09-21-2006
How to remove all lines with something other than numbers
Hi,
How would I get rid of lines having something else than numbers (such as tabs,white space, special characters, empty line, letters).
So I have big file with numers as follows:
12345678901
23456789012
32343678901
42345638901
52345678901
and I sometimes the file might contain some stuff not belonging there.
So if someone could help me with some nice one-liner to remove all lines that does not follow the format I want: 11 numbers and nothing else.
Thanks,
//Juha
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COLCRT(1) General Commands Manual COLCRT(1)
NAME
colcrt - filter nroff output for CRT previewing
SYNOPSIS
colcrt [ - ] [ -2 ] [ file ... ]
DESCRIPTION
Colcrt provides virtual half-line and reverse line feed sequences for terminals without such capability, and on which overstriking is
destructive. Half-line characters and underlining (changed to dashing `-') are placed on new lines in between the normal output lines.
The optional - suppresses all underlining. It is especially useful for previewing allboxed tables from tbl(1).
The option -2 causes all half-lines to be printed, effectively double spacing the output. Normally, a minimal space output format is used
which will suppress empty lines. The program never suppresses two consecutive empty lines, however. The -2 option is useful for sending
output to the line printer when the output contains superscripts and subscripts which would otherwise be invisible.
A typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
SEE ALSO
nroff/troff(1), col(1), more(1), ul(1)
BUGS
Should fold underlines onto blanks even with the `-' option so that a true underline character would show; if we did this, however, colcrt
wouldn't get rid of cu'd underlining completely.
Can't back up more than 102 lines.
General overstriking is lost; as a special case `|' overstruck with `-' or underline becomes `+'.
Lines are trimmed to 132 characters.
Some provision should be made for processing superscripts and subscripts in documents which are already double-spaced.
3rd Berkeley Distribution May 7, 1986 COLCRT(1)