Linux的隐藏功能

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# on my machine
$ ssh -X linuxserver
# on remote machine
$ gedit /etc/my.cnf &

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cd -

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ngrep -d any -W byline port 80

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apropos

gyaresu@debian:~/bin$ apropos ettercap
etter.conf (5)       - Ettercap configuration file
ettercap (8)         - (unknown subject)
ettercap_curses (8)  - (unknown subject)
ettercap_plugins (8) - (unknown subject)

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NAME
 units -- conversion program

DESCRIPTION
 The units program converts quantities expressed in various scales to their 
equivalents in other scales.  The units program can only handle multiplicative
scale changes.  It cannot convert Celsius to Fahrenheit, for example.
It works interactively by prompting the user for input:

     You have: meters
     You want: feet
             * 3.2808399
             / 0.3048

     You have: cm^3
     You want: gallons
             * 0.00026417205
             / 3785.4118

     You have: meters/s
     You want: furlongs/fortnight
             * 6012.8848
             / 0.00016630952

     You have: 1|2 inch
     You want: cm
             * 1.27
             / 0.78740157

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cp arq{,.bak}

cp arq arq.bak

!! 

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Description: Small toolbox-style utilities for Debian systems
 These programs are designed to integrate with standard shell tools,
 extending them to operate on the Debian packaging system.
 .
  dgrep  - Search all files in specified packages for a regex
  dglob  - Generate a list of package names which match a pattern
 .
 These are also included, because they are useful and don't justify
 their own packages:
 .
  debget       - Fetch a .deb for a package in APT's database
  dpigs        - Show which installed packages occupy the most space
  debman       - Easily view man pages from a binary .deb without extracting
  debmany      - Select manpages of installed or uninstalled packages
  checkrestart - Help to find and restart processes which are using old
                 versions of upgraded files (such as libraries)
  popbugs      - Display a customized release-critical bug list based on
                 packages you use (using popularity-contest data)

Description: additional unix utilities
 This is a growing collection of the unix tools that nobody thought
 to write thirty years ago.
 .
 So far, it includes the following utilities:
  - sponge: soak up standard input and write to a file
  - ifdata: get network interface info without parsing ifconfig output
  - ifne: run a program if the standard input is not empty
  - vidir: edit a directory in your text editor
  - vipe: insert a text editor into a pipe
  - ts: timestamp standard input
  - combine: combine the lines in two files using boolean operations
  - pee: tee standard input to pipes
  - zrun: automatically uncompress arguments to command
  - mispipe: pipe two commands, returning the exit status of the first
  - isutf8: check if a file or standard input is utf-8
  - lckdo: execute a program with a lock held
Homepage: http://kitenet.net/~joey/code/moreutils/

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ls -l /home/someuser/somedir/somefile

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yes | do_you_agree

NAME
       yes - output a string repeatedly until killed

SYNOPSIS
       yes [STRING]...
       yes OPTION

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diff some_local_file <(ssh somehost "cat some_remote_file")