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Top Forums Shell Programming and Scripting Awk to extract lines with a defined number of characters Post 302430194 by clx on Thursday 17th of June 2010 12:18:10 AM
Old 06-17-2010
try:
Code:
$ cat x
> ID 1
DFNSALKDNJRGNLANGKNGRIIGINREVN
> ID 2
KJDFKDSJGNIHG
> ID 3
BDSBGOBAOEURBOUEABG
> ID 4
DNFKSAD
> ID 5
KJDFKDSJGNIHG
> ID 6
BDSBGOBAOEURBOUEABG
$ awk '/^>/ {R=$0}! />/ && length($0) >= 10 && length($0) < 20 {print R"\n"$0}' x
> ID 2
KJDFKDSJGNIHG
> ID 3
BDSBGOBAOEURBOUEABG
> ID 5
KJDFKDSJGNIHG
> ID 6
BDSBGOBAOEURBOUEABG
$

I didn't understand the file_c requirement.
 

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gt5(1)							      General Commands Manual							    gt5(1)

NAME
gt5 - a diff-capable 'du-browser' SYNOPSIS
gt5 [ dir | file | dir file | file file2 ] [options] DESCRIPTION
gt5 reads the output of du, compares it with a du-log saved by the last run, converts it into HTML and opens the resulting file with a textbrowser. If files are given on the commandline they are expected to be (optionally gzip/bzip2-compressed) logfiles of du -akx /some/dir. It is up to you to take care that the given directories/files represent the same directory. gt5 will show lots of new files if you don't. ;-) OPTIONS
--cut-at float Files and directories that are below float percent of their parents are not shown. Default is 0.1, gt5 will accept values between 0.01 and 30. --debug Turn on debug. Generate HTML files and do not run browser. --diff-dir directory Use directory instead of ~/.gt5-diffs/ to read/store du-logs. This switch is ignored if gt5 is only used with files. --discard Do not save the current state, in other words: be able to diff against the old state again. This feature is disabled if gt5 is only used with files. --help Display brief help. --link-files Also insert links to files to access them from within gt5. This can be very handy if your browser is configured to handle the files MIME-type correctly. This feature is disabled if gt5 is only used with files. --max-depth int Do not show anything below a depth of int directories. Default is 5 (also see BUGS below). --max-lines int Only consider the int biggest files and directories within the output of du. --no-diffs Use this if you are not interested in the history of the directories processed, for example in /tmp. --save-as file DEPRECATED, use du -akx or du -ak (see --with-mounts), save the output to a file and run gt5 against one (ore two) of these files later. --save-state Force saving current state, overwriting a previous --discard. (Some people seem to have gt5 aliased to 'gt5 --discard'.) --verbose Display messages. --with-mounts By default gt5 calls du with -akx to ignore mounted filesystems. Use this to inspect mounted partitions too, i.e. call du with -ak HELPERS
If gawk or a textbrowser are missing and you want to install them into ~/bin (or /usr/local/bin if you have write access there), gt5 comes with the following helpers: --get-gawk Download, compile and install a copy of gawk. --get-links Download, compile and install a copy of links. --get-links2 Download, compile and install a copy of links2. --get-elinks Download, compile and install a copy of elinks. TEXTBROWSERS
It is recommended to use links with gt5. Other textbrowsers are also possible but there are several good reasons why links is given prior- ity over the others: elinks: links is much faster on startup/exit lynx: does not honor a documents coloring netrik: no colors, unfavourable cursor navigation retawq: no colors, can't handle <a name>-tags w3m: Version 0.5.2 and later are known to work. Older versions experienced unfavourable handling of <a name>-tag, unfavourable cursor navigation and no colors Only links/links2, elinks and lynx are now considered usable (and also chosen in that order). See ENVIRONMENT/GT5_BROWSER below. FILES
~/.gt5.html contains a copy of the last run ~/.gt5-diffs/ compressed du-logs are stored here ENVIRONMENT
GT5_BROWSER force using a (specific) textbrowser GT5_CHARSET force using a (specific) charset for HTML header instead of using $LANG GT5_DEBUG_DIR Directory where to write gt5.debug* data if --debug option is set. BUGS
Directories at depth max-depth are not browsable and so look like files. AUTHOR
Thomas Sattler <gt5 at gmx dot net> SEE ALSO
du(1), links(1), elinks(1), lynx(1) gt5 v1.4.0.1 July 2009 gt5(1)
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