![]() The most interesting addition to classic vi implementation other than improved compatibility is the inclusion of support for multi-level undo, a graphical user interface. Moreover, it is compatible with all the vi versions (i.e., upwards compatibility). It follows POSIX 1003.2-1 standard, which makes it compatible, virtually, with all the Unix and Linux distributions including MS-DOS, Macintosh, Amiga, VMS, BeOS, RISC OS, IBM OS/390, Atari MiNT, Windows 95, and Windows NT. It has added new functionalities and improved many primitive vi editors. The vim editor is a successor to the vi editor and stands for Vi IMproved. Consequently, it is lightweight and fast. Moreover, the vi is an easy-to-use CLI-based editor used for any plain-text file. Therefore, it doesn’t require any extra packages to be installed before its use. The vi editor is the most classic text editor available along almost all the Linux distributions. Introduction to vi and vim Editors in Linux Then, we will move right away to their use for opening a file with the cursor pointing to a particular line number. This tutorial demonstrates the method to open a plain text file with a specific line number with vi or vim editors using the Bash command-line interface (CLI).įirst, we will briefly introduce the vi editor and its successor vim editor. 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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