Ubuntu – How to grep whole manual

bashgrepmanpage

I can do for example

man cp | grep verbose

to findout if cp man has word "verbose", how can I do something like (pseudo-code)

man * | grep copy

to find out what command to use for coping?

Best Answer

man -k printf

Search the short descriptions and manual page names for the keyword printf as regular expression. Print out any matches. Equivalent to apropos -r printf.

Or as you can see you can also use apropos -r printf

Example...

man -k "test"

Test (3perl)         - provides a simple framework for writing test scripts
cupstestdsc (1)      - test conformance of postscript files
cupstestppd (1)      - test conformance of ppd files
DBD::Gofer::Transport::null (3pm) - DBD::Gofer client transport for testing
DBD::Gofer::Transport::pipeone (3pm) - DBD::Gofer client transport for testing
dh_auto_test (1)     - automatically runs a package's test suites
dh_testdir (1)       - test directory before building debian package
dh_testroot (1)      - ensure that a package is built as root
dh_testversion (1)   - ensure that the correct version of debhelper is installed
ExtUtils::testlib (3perl) - add blib/* directories to @INC
feature_test_macros (7) - feature test macros
File::CheckTree (3perl) - run many filetest checks on a tree
filetest (3perl)     - Perl pragma to control the filetest permission operators
ftm (7)              - feature test macros
gcov-4.2 (1)         - coverage testing tool
make-memtest86+-boot-floppy (1) - (unknown subject)
Memoize::ExpireFile (3perl) - test for Memoize expiration semantics
Memoize::ExpireTest (3perl) - test for Memoize expiration semantics
mysql_client_test (1) - test client API
mysql_client_test_embedded (1) - test client API for embedded server
mysqlmanager-pwgen (1) - internal test-suite program
mysqlmanagerc (1)    - internal test-suite program
mysqltest (1)        - program to run test cases
mysqltest_embedded (1) - program to run embedded test cases
ndb_cpcd (1)         - automate testing of NDB (development use only)

Related Solutions

Ubuntu – How to grep in the content of a string variable

If you are just looking for a word you can use a for loop.

STRING="upgrade this if you can"
for x in $STRING; do
   echo $x
   if [ "$x" = 'upgrade' ]; then
       echo found
       y=$x
       break
   fi
done 
echo $y

If upgrade is always in the same position you could try array assignment.

declare -a z
z=($STRING)
echo ${z[0]}

Ubuntu – grep string from a pcap file

Try adding the -a or --binary-file=text options

grep -aE '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' file.pcap

grep --binary-file=text -E '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' file.pcap

This appears to work for a random pcap file that I downloaded from wiki.wireshark.org i.e.

$ grep -E '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' NTLM-wenchao.pcap
Binary file NTLM-wenchao.pcap matches

but

$ grep -aE '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' NTLM-wenchao.pcap
Host: 192.168.0.55
Host: 192.168.0.55
Host: 192.168.0.55
Location: http://192.168.0.55/default.aspx
MicrosoftSharePointTeamServices: 12.0.0.6421
<body><h1>Object Moved</h1>This document may be found <a HREF="http://192.168.0."_?"_Ea@yÀ¨[À¨ÃPþµû%RÑ_Pü>ÕGET /default.aspx HTTP/1.1
Host: 192.168.0.55

etc.

Be aware of the warning (from the man page man grep) that

If TYPE is text, grep processes a binary file as if  it
were  text;  this is equivalent to the -a option.  Warning: grep
--binary-files=text might output binary garbage, which can  have
nasty  side  effects  if  the  output  is  a terminal and if the
terminal driver interprets some of it as commands.

Note that although you can use the \d regex (for digit), it is only supported by grep in PCRE mode (i.e. with the -P switch).

Best Answer

Related Solutions

Ubuntu – How to grep in the content of a string variable

Ubuntu – grep string from a pcap file

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