Compare file occurences between two folders in Linux console

Show which exists only in today, only in yesterday or differ in both

Same as above but sorted

Same as first line but dives into subdirectories

 

Get only regex matches from grep in Linux console

To get only the matches from a regex in grep use the option o.

example.txt

Get every number that is after $$b

 

Important: No regex grouping like ‘(\$\$b.*)’ is permitted.

Rename multiple files with prefix or suffix in Linux console

Add a suffix

Exmpale to add an underscore “_” at the end each text file:

Add a prefix

Exmpale to add an underscore “_” in front of text each file name:

[alert type=”info”]Make sure you run those commands in Bash shell.[/alert]

Alternative: Add suffix with find command

Exmpale to add an underscore “_” at the end each text file:

Alternative: Add prefix with find command

Exmpale to add an underscore “_” in front of text each file name:

[alert type=”info”]This will run in any shell and you can easily define the set of files that should be renamed by using the name or iname parameter for find.[/alert]

Watch file system changes for a directory in Linux console

Sometimes it is very useful to see how content of a directoy changes; If you have a cron that writes into a directoy.

Updates ls content of current directory every second

Highlights updates of ls of current directoy every 5 seconds

Iterating over an array in Bash

Iterating over an array in Java