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How to remove new lines from files or pipe streams under Linux? This post contains simple examples that show how to use common Linux shell tools such as tr, awk/gawk, perl, sed and many others to delete new line characters. C and C++ source codes are also provided. They can be compiled into a binary tool that removes new lines. To get started, here is an example text file: days.txt. Lets have a look at its content by running the following command from shell.