Linux/UNIX Commands

[top] apropos 

apropos print
Searches through man pages for relavent topics regarding the word print.


[top] cat 

cat > file.txt
Creates the file named "file.txt" and accepts the following lines as file contents.  Press CTRL+d to exit data entry.


[top] cut 

cut -d: -f5 file.txt
Cuts data from the fifth field a colon delimited file.


[top] man 

man -k list
Searches man pages for references to 'list'.  Also see the 'apropos' command.

man -S 5 passwd
Displays the fifth man page section for the passwd command.

man sections 
1 - Creates a new file containing standard output.  If the file exists then its overwritten
2 - Appends standard output to the file.  If the file does not exist it is created
3 - Creates a new file containing standard error.  If the file exists then its overwritten
4 - Appends standard error to the file.  If the file does not exist it is created
5 - Creates a new file containing both standard output and standard error.  If the file exists then its overwritten
6 - Uses the contents of the specified file as standard input to the receiving program
7 - Uses the contents of the following lines as standard input to the receiving program.
8 - Uses the contents of the specified file as standard input and standard output
9 - Uses the contents of the specified file as standard input and standard output


[top] redirection operators 

 - Creates a new file containing standard output.  If the file exists then its overwritten.
>> - Appends standard output to the file.  If the file does not exist it is created.
2> - Creates a new file containing standard error.  If the file exists then its overwritten.
2>> - Appends standard error to the file.  If the file does not exist it is created.
&> - Creates a new file containing both standard output and standard error.  If the file exists then its overwritten.
< - Uses the contents of the specified file as standard input to the receiving program.
<< - Uses the contents of the following lines as standard input to the receiving program.
<> - Uses the contents of the specified file as standard input and standard output.