Bash split file text

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Like Article. Next cut command in Linux with examples. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. But before starting it becomes imperative for us to know something on IFS Internal Field Separator as it will constitute the majority of the method.

IFS is nothing but a variable which is used for defining character which in turn is used for separation of a pattern into tokens. The tokens are then used for operations as required by the problem statement which is being tried to be solved. In simple terms, we call these variables as something which will separate a series of characters into recognizable parts.

For example, space is used for signifying different words, newline is used for representing separate sentences and so on. Bash has IFS as a reserved internal variable to recognize word boundaries. Hence, we would first need to assign IFS as a recognizable character as per the requirement to do the split. By default, the variable IFS is set to whitespace. This technique is used when there is a multiple character through which we would like to split the string.

For example, in a message log, let us say a particular string is occurring after every sentence instead of a full stop. One would need to use that to separate different sentences and, in the example, we will show a detailed process for the same. Just from a pseudo code understanding perspective, we would use while loop and break down the string using a regular expression and then store each element into individual indexes in an array.