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A common usage is to pipe another command through less to be able to see all the output, such as ls | less. less: The less command is used for viewing text files as well as standard output.To close and save a file you are working on, use Ctrl-X. Commands listed at the bottom of the screen are accessed via pressing Ctrl followed by the letter. nano: Nano is a simple text editor for the command line.You could also use cat file1 > file2 to append the contents of file1 to the end of file2. Using cat FILENAME file adds the contents of the first file to the second and displays both on the screen, one after the other. The simple command cat FILENAME displays the contents of the file. cat: The cat command, short for concatenate, is useful for viewing and adding to text files.Three other commands are useful for dealing with text. There are many excellent tutorials available on using them, but here are a couple of good Web sites to get you started: For example, if you want to find the string "cat" and replace it with "dog" in a file named pets, type sed s/cat/dog/g pets.īoth grep and sed are extremely powerful programs. sed: The sed (or Stream EDitor) command allows search and replace of a particular string in a file.For example, grep blah file will search for the text "blah" in the file and then print any matching lines. grep: The grep command allows you to search inside a number of files for a particular search pattern and then print matching lines.Search and edit text files by using the following commands. Learn More Buy Searching and Editing Text Files