![]() Press Control+P will display the previous command, press enter to execute it. ![]() Type !- 1 and press enter from the command line.Type !! and press enter from the command line.Use the up arrow to view the previous command and press enter to execute it.This is also sometimes called a return code, or in some cases, an error code, although the terminology here may be slightly different.įollowing are the 4 different ways to repeat the last executed command. What do exit codes mean?Īn exit code or exit status is a number that is returned by an executable to show whether it was successful. Its purpose is to indicate either that the software operated successfully, or that it failed somehow. What does the exit status of a program indicate?Īn exit status is the number returned by a computer process to its parent when it terminates. ![]() ![]() wc -l foo will count the number of lines in foo. The tool wc is the “word counter” in UNIX and UNIX-like operating systems, but you can also use it to count lines in a file by adding the -l option. How can you check the amount of lines in a file? ![]()
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