Concatenate and display file contents:
cat file1 file2
Display the contents of several files (stopping at each page):
more file1 file2
less file1 file2 
Display the first 10 lines of a file: head -10 file
Display the last 10 lines of a file: tail -10 file
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Commands for Handling files and directories

Create a directory:  mkdir dir Create nested directories: mkdir -p dir1/dir2Changing...
Listing files

List all “regular” files (not starting with .) in the current directory:lsDisplay a long...
File name pattern matching

Concatenate all “regular” files: cat *Concatenate all “hidden” files: cat .*Concatenate all files...
Handling file contents

Show only the lines in a file containing a given substring: grep substring fileCase insensitive...
Commands for changing file access rights

Add write permissions to the current user:chmod u+w fileAdd read permissions to users in the file...