Actions

Linux

From kemiko

Revision as of 09:28, 29 December 2016 by Kemiko (talk | contribs)

Favorite Commands:

Some Notation:
FILE: a filename
DIRECTORY: a directory
PATH: a directory/file location
LINE: a line's contents
COMMAND: a command like awk, cat, echo, grep, etc. 
LITERAL: a literal/static variable no REGEX
REGEX: "REGular EXpression"...a pattern matching expression
DATE: a date...format may vary
TIME: a time...format may vary
NUMBER: a numeric value
SEPARATOR: a field separator
VARIABLE: a variable
/dev/null: a device file representing nothing
read: read's stdin
  • find . -type f -exec grep -n "LITERAL/REGEX" {} /dev/null \;    # search regular files for "LITERAL/REGEX" inside...printing "path/filename:line:content"
  • find . -type f -exec ls -hlatr {} \; | sort -hk5,5    # long list all files under a directory, sort smallest to largest (human size)
  • find . -maxdepth 1 -type f    # list only regular files in current directory
  • rm -rf PATH    # remove a "PATH" and all content
  • awk -F'SEPARATOR' '{print $NUMBER}'    # print the column "NUMBER" delimited by "SEPARATOR"
  • locate LITERAL    # print the PATH of file name matching "LITERAL"
  • less -S FILE    # page "FILE" with no line wrap
  • du -hd1 | sort -h    # disk usage (human size),one level deep and sum by directory...pipe to sort smallest to largest
  • wget PATH    # get "PATH" from http/ftp
  • scp PATH1 username@hostname:PATH2    # put "PATH1" to "PATH2"
  • scp -r PATH1 username@hostname:PATH2    # same as above, but recursively gets directory and all files under it
  • scp username@hostname:PATH1 PATH2    # get "PATH1" to "PATH2"
  • scp username@hostname:PATH1 PATH2    # same as above, but recursively gets directory and all files under it
  • cat FILE    # display contents of "FILE"
  • vi FILE    # edit/view "FILE"
  • echo $VARIABLE    # display contents of variable "VARIABLE"
  • >FILE    # zeros out "FILE"
  • cp /dev/null FILE    # zeros out "FILE"
  • touch FILE    creates a FILE of zero size
  • \COMMAND    # unalias "COMMAND"
  • "COMMAND"    # unalias "COMMAND"
  • while [ 1 ]; do COMMANDS; sleep NUMBER; done    # repeat COMMAND with NUMBER seconds between
  • cat FILE | while read LINE; do COMMAND; done    # read a file line by line doing a COMMAND until file's end
  • uname -a    # lists basic system information
  • uptime    # print time since system boot
  • apt-get update    # updates the system's package lists
  • top    # traditional performance monitor
  • htop    # improved performance monitor
  • itop    # a top like tool I programmed for Informix 9.40 FC7
  • a2ensite kohlmeyer.us.conf    # Apache...enable a virtual host
  • ffmpeg -ss 4.5 -i input.mp3 -t 1.7 output.mp3    # cut a mp3 from 4.5 seconds to 6.2 seconds
  • vlc FILE    # play audio or video FILE
  • eog FILE    # display image FILE
  • gnome-system-monitor    # graphical display of system resources
  • gimp    # run GNU Image Manipulation Program