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Bash tips, tricks and code snippets

• Bash function to pretty-print JSON
• Bash oneliner to block script kiddies
• Bash tip: Remove leading zeros from a variable
• Command line logging history
• Convert file from iso-8859-1 to utf8
• Convert string between lowercase and uppercase
• Copy a whole directory preserving permissions
• Copying an array in Bash
• Create a netcat http server in a few lines of code
• Date conversion to and from epoch
• Depth limited recursive grep search
• Display weather from terminal
• Generate a simple .txt sitemap
• Get lastmod of file in epoch seconds using stat
• Increment a variable
• Inserting text at the beginning of a file
• MUTEX locking a script to prevent parallel or multiple execution
• Making a compressed disk image using dd and pv to indicate progress
• Output (echo) to stderr rather than stdout
• Output whitepace as control characters
• Padding strings left or right
• Read a string into an array in Bash
• Read one per line output into an array
• Read output of command into an array
• Redirection permission problems when using sudo
• Running a script as another user
• Test if a directory is empty
• Testing whether a glob has any matches
• Uppercase a variable’s first character
• Use sed to insert lines before or after a match