The script verifies that an argument was provided and that it's an existing file before it sorts it and sends the output to the uniq command. This combined use of sort and uniq surrounding the file name means a command like it can't be turned into an alias, but it could be turned into a simple script like this: #!/bin/bash While this technique doesn't work all that well with fairy tales, it works just fine for lists of meeting attendees, grocery shopping lists etc. In addition, if sorting the contents of your file contents is helpful, this approach may be ideal. The uniq command ensures that sequential identical lines are reduced to one. The sort command sorts the lines in alphanumeric order. If you don't need to preserve the order of the lines in the file, using the sort and uniq commands will do what you need in a very straightforward way. Characters should be in quotation marks if they. If you take the plunge without a bit of insider know-how, you could well be left scratching your head at the results. However, like many Linux commands, it has a few quirkswhich is fine, as long as you know about them. On the other hand, it's also not that hard to turn the command into a simple script. The grep filter finds a file for a specific character pattern and shows every line that includes that pattern. 01:13 Finding Matching Lines of Text on Linux The uniq command is fast, flexible, and great at what it does. The only problem with the awk '!x++' command is that it's not all that easy to remember. Just remove the exclamation point (signifying "not") and you will see only the duplicated lines: $ awk 'x++' grouchy_princess In fact, if you simply want to see any duplicated lines, you only need to change the command in a minor way. Note that each of the duplicated lines is now displayed only once and in its initial position. ![]() ![]() The awk command that does this work looks like this: $ awk '!x++' grouchy_princess If the princess ran into a friend who didn't want to chat with her, Whenever she went for a walk, she left her castle smiling,īut if she ran into anyone frowning or arguing with someone else, Once upon a time, there was a lovely princess with a foul temper.
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