Bash Shell - Linux

Front 1

command > filename

Back 1

Redriect the standard output to a file or device, creating the file if it does not exist and overwriting the file if it does exist.

Front 2

command < filename

Back 2

Redirect the standard input from a file or device to a program.

Front 3

command >> filename

Back 3

Redirect the standard output to a file or device, appending the output to the end of the file.

Front 4

command >! filename

Back 4

In the C-shell and Korn shell, force the overwriting of a file if it already exists. This overrides the noclobber option.

Front 5

command 2> filename

Back 5

Redirect the standard error to a file or device in the Bourne shell

Front 6

command 2>> filename

Back 6

Redirect the standard error to a file or device in the Bourne shell.

Front 7

command 2>&1

Back 7

Redirect the standard error to the standard output in the Bourne shell.

Front 8

command >& filename

Back 8

Redirect the standard error to a file or device in the C-shell.

Front 9

command | command

Back 9

Pipe teh standard output of one command as input for another command.

Front 10

command |& comand

Back 10

Pipe the standard error as input to another command in the C-shell.

Front 11

cat filename 1> output.file 2> error.file

Back 11

just an example
cat filename 1> output.file 2> error.file

Front 12

place in background

Back 12

command-line &

Front 13

list all jobs in background

Back 13

jobs

Front 14

bring a job forward

Back 14

fg %jobnum

Front 15

place a foreground program in background

Back 15

bg

Front 16

notify when a job completes

Back 16

notify %jobnumber

Front 17

Cancel a job running in background

Back 17

kill %jobNumber
or
kill processNumber

Front 18

execute commands at a specified time and date

Back 18

(EXAMPLE)
at -f mycrontest.sh 10pm tomorrow

Front 19

some time keywords for the "at" command

Back 19

am
pm
monday tuesday wednesday
now
noon
midnight
today
tomorrow
next <time-segment>
next week

Front 20

at <options>

Back 20

at -l jobnum
(list current at jobs)

at -r jobnum
(cancel a job)

at -m jobnum
(be notified by mail when job finishes)

Front 21

special character
* (asterick)

Back 21

Match any set of characters
*

Front 22

special character
? (question mark)

Back 22

Match any single character
?

Front 23

special character
[ ] (brackets)

Back 23

Match a class of possible characters
[ ]

Front 24

special character
\ (back slash)

Back 24

Quote the following charcter. Used to quote special characters.

Front 25

The Bash shell provides the following features:

Back 25

**** Input/output redirection
**** Wildcard characters (metacharacters) for filename abbreviation
**** Shell variables and options for customizing your environment
**** A built-in command set for writing shell programs
**** Shell functions, for modularizing tasks within a shell program
**** Job control
**** Command-line editing (using the command syntax of either vi or Emacs)
**** Access to previous commands (command history)
**** Integer arithmetic
**** Arrays and arithmetic expressions
**** Command-name abbreviation (aliasing)
**** Upwards compliance with POSIX
**** Internationalization facilities
**** An arithmetic for loop

Front 26

TWEAK (bonus):
colorize your prompt

Back 26

############ ADD TO ~/.bashrc

NORMAL=`tput sgr0 2> /dev/null`
BOLD=`tput bold 2> /dev/null`
RED="\[\033[31m\]"
GREEN="\[\033[32m\]"
BLUE="\[\033[34m\]"
GREY="\[\033[1;30m\]"
PURPLE="\[\033[0;35m\]"

PS1="\[\u@$RED\h$NORMAL:\W\]\\$"
############