Bash Bad Substitution Variable

I keep getting this message bad substitution. The bash shell in particular which is the default on almost every linux distribution and available on almost every unix too has some strong string manipulation utilities built in. Bash bad substitution when converting string variables to uppercase or lowercase converting strings in your bash script from lowercase to uppercase or viceversa is a common requirement.

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So i googled the problem and every example i came up with supposedly works but not on my computer.

Bash bad substitution variable.

Recent versions of bash e g. You can use it for manipulating and expanding variables on demands without using external commands such as perl python sed or awk. An essential feature of programming is the ability to use a name or a label to refer to some other quantity. Here i m using bash 4 4 19 provide a built in way for uppercasing and lowercasing strings.

Bash variables and command substitution using variables to refer to data including the results of a command. Such as a value or a command. T he character is used for parameter expansion arithmetic expansion and command substitution. This guide shows you how to use parameter expansion modifiers to transform bash shell variables for your scripting needs.

The shell is a rather good tool for manipulating strings. Username0 echo username0 has been declared but is set to null echo username0 username0 whoami will not echo. Substituting strings within variables. Here s a simple script that supposedly works.

Bin bash o 12345 a o b a echo a echo b but when i run it i get this. Bin bash param sub sh whether a variable has been declared affects triggering of the default option even if the variable is null. I ve been working on a bash script using an array. Bin basha1 win 12 01 02 03 04 a2 pre 04 05 06 a3 msn 06 07 08 09 given the above arrays i want the script to return echo the following in a loop win12 01 02 03 04pre04 05 06 07msn06 07 08 09but i can t get it to do as such.

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