Linux environment variables, CP commands, MV commands, and document viewing

Linux Environment Variables PATH:

Configure the command file to PATH , you can run it directly. the echo $PATH command allows you to view path paths:

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For example , if we copy the LS command file to a different directory, and then add the directory to the PATH , the copied command file can also be run directly:

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But this way only the current terminal can be effective, after opening a new terminal, it expires:

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If you want to take effect at all terminals, change the added environment variable to permanent, and we can use the vi/etc/profile command to edit the profile. This file is used for each boot load initialization variable:

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The source/etc/profile command allows the content in the profile to take effect immediately:

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This is the time to open a new terminal and run the command you just added:

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To Delete This command, simply re-assign the environment variable, then delete the command file, or you can use the way to edit the profile:

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CP Command :

CP is the copy of the abbreviation, is used to copy files and directories, the copy directory will need to add- r option:

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When the directory is copied, it will be copied to the target directory if it is already present, the target a directory that does not exist will copy the original directory and change its name:

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MV Command :

The MV is the abbreviation for move, which moves the file or directory to another directory and can be renamed in the current directory using the rename:

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When moving a file to the target directory, there is already this file exists will ask whether to overwrite, if you do not want to have this hint, you need to use absolute path to run this command:

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When moving a file to the target directory, the target directory does not exist and the original directory is changed to the name of the target directory:

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when moving files to the target directory, the target directory will be placed in the target directory, which is the same as the CP command.

some commands for document viewing :

the cat command can view the contents of the file, plus -A option to view all content, plus - n to view the number of rows:

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The TAC command can view the contents of the file in reverse order:

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The more command is also used to view the text content, this command is not displayed all, is a page by page display, you need to press the space bar to page down,ctrl+b is to page up:

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LessCommands and MoreThe command is the same as the page display, but Lesssupport the Direction key scrolling view, also supports the way of page flipping, and one point is not like Morethe command will exit automatically after it is finished, but you need to pressQkey to exit. Lessalso supports querying the location of a character, first entering/Then enter the characters you want to query, then go to query, pressNKey can also continue to query,Shift+nYou can query forward. Input?is the/the opposite of the function is to query from the back forward. InputgNavigate to the beginning of the lineshift+gnavigates to the end of the line. Because Lesshave MoreThere are features and features that are not, so basically all are used LessInstead of using More.

The Head command can view the first ten lines of a file, plus the- n option to specify the number of rows viewed:

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The tail command can view the 10 lines at the end of a file, plus the- n option to specify the number of rows to view, plus the- f option to view the dynamic file because the plus - F option does not exit the file, so it is generally used when looking at the log:

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Linux environment variables, CP commands, MV commands, and document viewing