Concatenate all “regular” files: cat *
Concatenate all “hidden” files: cat .*
Concatenate all files ending with .log: cat *.log
List “regular” files with bug in their name: ls *bug*
List all “regular” files ending with . and a single character: ls *.?
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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...
Displaying file contents

Concatenate and display file contents:cat file1 file2Display the contents of several 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...