linux most useful command

linux most useful command: cat command, strings command, cp command, mv command, which command etc.

1. Display file contents:

Command	Descriptions
cat	Displaying the Contents of Text Files
tac	Displaying the Contents of Text Files in reverse order
head	Displaying the Contents of Text Files the first 10 lines
tail	Displaying the Contents of Text Files the final 10 lines
strings	Displaying the contents of binary files
od	Displaying the contents of the file in octal format
more	Displaying the Contents of Text Files page-by-page
less	like more command, but more than more command

Managing files and directories:

Command	Descriptions
mkdir	create directory
mv	move or rename files and directory
cp	copy files and directory
rm	remove files
rmdir	remove empty directory

Note: cp, rm, rmdir commands using option -R to recursive copy directories, to remove a directory full of files. rm command with -R is dangerous.

Finding files:

Command	Descriptions
locate	fastest to search for files in linux directory tree
find	slower to search for files,but useful.
which	To search the directories in the PATH variable

Note: to see content of a certain variable in memory using echo $PATH.

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