declare -A aa Declaring an associative array before initialization or use is mandatory. Here’s the output of the above script: Ubuntu Linux Mint Debian Arch Fedora Method 2: Split string using tr command in Bash. echo is easy to use and mostly it fits our needs without any problem. You can access elements of a Bash Array using the index. 3.4 Filling the Extra Space When printing a small number like 27in a %5dfield, the question then became where to put the 27and what to put in the other three slots. echo ${ARRAY_NAME [2]} Print Bash Array with all the information. Bash Associative Array (dictionaries, hash table, or key/value pair) You cannot create an associative array on the fly in Bash. What you're doing is tricky. Print the Whole Bash Array. The empty spaces could be filled with the The sed based solutions will transform it in -option1 -option2 -with -space - option3 (length 5), but the above bash expansion will transform it into -option1 Bash arrays have numbered indexes only, but they are sparse, ie you don't have to define all the indexes. You can traverse through the array elements and print it, using looping statements in bash. I tried to set the space character using the \ symbol, but this doesn't help. At this point, the bash script has finished introducing the processing method of files with spaces. summary. Of course, you should remember to save the original IFS content and put the original content back after the script runs. There are different ways to print the whole elements of the array. This is because I intend to introduce bash loop concepts later in this series. Note that there has to be no space around the assignment operator =. I'm getting started with bash scripting. Access elements of Bash Array. You can only use the declare built-in command with the uppercase “-A” option.The += operator allows you to append one or multiple key/value to an associative Bash array. When writing a bash scripts most of us by default use echo command as means to print to standard output stream. If the index number is @ or *, all members of an array are referenced. This is also the case with echo command. You can print the total number of the files array elements, i.e. the size of the array: echo ${#files[@]} 5 The normal way is to avoid this and just pass the array values as arguments. However, with simplicity very often comes limitation. Declare an associative array. In the code below, the third array element is "Accessory Engine". Initialize elements. Now you can access the array to get any word you desire or use the for loop in bash to print all the words one by one as I have done in the above script. As of bash 4.2, you can just use a negative index ${myarray[-1]} to get the last element. 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