![]() If you would like to save the file under a different name, specify a filename. If you don't specify a name, changes will be saved to the current file. :w myprogram.c save the current changes to a file. Again, if this file exists in your current directory it will open it, or it will create it if it does not already exist in your current directory. If vim is already open and you would like to edit a different file, use the :e filename command (e.g. To open a file in vim (or create a new one if a file with this name does not exist): $ vim filename Note that all commands mentioned below (except for arrow keys) only work in COMMAND mode.Over time, you will likely spend more time in COMMAND mode than INSERT mode. To go back to COMMAND mode, you type the esc key. To go into INSERT mode from COMMAND mode, you type i.There is a third mode, VISUAL mode, that is used to highlight and edit text in bulk. In COMMAND mode, you execute commands (like undo, redo, find and replace, quit, etc.). Vim has two "modes": COMMAND mode and INSERT mode. vim has a bit of a learning curve, meaning that you may get somewhat frustrated with it until you have used it a few times. ![]() Despite its age, vim is one of the most popular editors in the world, and it is available on virtually every computing platform (or vi is available). Vim is a text editor that is a clone of the vi editor, which was created around 1976. ➜ grep -n -w "dfff" test6.Written by Chris Gregg and Dominique Yahyavi, with modifications by Peter Johnston, Nick Troccoli, and Lisa Yan In the second example, we used multiple grep commands and pipes to match lines containing both “dfff” and “apple” words in the file test6.txt. ➜ grep -n -w -e "dfff" -e "apple" test6.txt In the first example, we use the grep -e option to match the line containing the word “dfff” or “apple” in the file test6.txt. * Match file containing keyword1 or containing keyword2 … : OR * Match file containing keyword1 and containing keyword2 … : AND But matching multiple keywords has two meanings: Grep matches multiple keywords, which we often use on a daily basis. Sometimes, however, we also need to count the keyword to appear in the file, at the same time, according to the line number in reverse order. In the example above, we can count the number of lines or the total number of occurrences of a keyword in a file. In the following example, the grep directory contains files whose filenames contain the keyword “test”, and we use the ls command, pipe, and wc command to count the number of files whose filenames contain the keyword “test” in the directory. Grep count the number of files in the directory whose filename contains the specified keyword w, -word-regexp The expression is searched for as a word (as if surrounded by `]' see re_format(7)). o, -only-matching Prints only the matching part of the lines. In the following example, we use grep -w to count the number of times of the string “dfff” in the file ➜ grep -o -w "dfff" test6.txt | wc -l Options: ![]() Grep counts the number of times of the specified content in a file You can also use the grep command, pipe, and wc command to achieve the same effect as the grep-c option in the following example. Using grep -c options alone will count the number of lines that contain the matching word instead of the number of total matches. In the following example, we will use the grep command to count the number of lines in the file test6.txt that contain the string “dfff” ➜ grep -c "dfff" test6.txt ![]() Grep counts the number of lines in the file that contain the specified content
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