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Bash-like Customizable Prompt in Korn Shell

Bash has built-in support for extensive PS1 prompt customization and as a result many people customize their shell prompts. There is no equivalent built-in support for PS1 customization in ksh93 but such support can easily be added using discipline functions.

Korn Shell Launcher for Windows Subsystem for Linux

In this post, I show you how to create a Korn Shell launcher for the new Windows Subsystem for Linux.

Zero Padding Brace Expansions in the Korn Shell

Both bash and zsh shells support leading zeros in ranges: $ echo {1..10} 1 2 3 4 5 6 7 8 9 10 $ echo {01..10} 01 02 03 04 05 06 07 08 09 10 $ echo {001..010} 001 002 003 004 005 006 007 008 009 010 $ From the bash manpage section on brace expansion: Supplied integers may be prefixed with 0 to force each term to have the same width. When either x or y begins with a zero, the shell attempts to force all generated terms to contain the same number of digits, zero-padding where

The Time Keyword in Bash

The word time is one of the bash shell reserved words. It is not a bash shell builtin. $ builtin time bash: builtin: time: not a shell builtin Bash does support the older Bourne shell keyword times as a builtin. This builtin prints out the user and system times used by the shell and its children. So where is the time reserved word used in the bash shell? It is primarily intended for printing pipeline timing statistics. From the current online bash documentation: The format for a pipeline is [time [-p]] [!] command1 [| command2 …] The output of each

Shell String Concatenation

Many people are unaware that string concatenation using the += syntax is fully supported in modern versions of both the Bash and Korn shells Here is a simple example which demonstrates the syntax: str=”Hello” $ str+=” ” $ str+=”World” $ echo $str Hello World $ If you use this syntax with “numbers”, you end up with a string that looks like a number but is not a number. $ a=2 $ a+=4 $ echo $a $ 24