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I learned shell programming for the first time.ArticleShellProgramIt must start "#! /Bin/sh. Although I know that all statements starting with "#" in shell are comments, I never think "#! /Bin/sh is also a comment, just as there is no doubt that a C program must have a main function. But some time ago I heard that "#! /Bin/sh "is also a comment and dispensabl

★ Use the "Recycle Bin" Edit menu If you want to delete most of the files in the Recycle Bin without having to bother to select them by one by one, you can first select the files that are not deleted, and then click edit → reverse select, and the system will select the files you want to delete, and then click file → delete. ★ Extend the right mouse button function of "Recycle

Careless operation of the computer's recycling station to delete, but also worried about the later accidentally deleted important files, so still want to keep the Recycle Bin more secure, then the Recycle Bin deleted how to restore it? The following edit for the novice friend to introduce several repair deleted Recycle Bin method. Method One: The Recycle

Find out what binary log files are currently The code is as follows Copy Code Mysql> show binary logs;+------------------+-----------+| Log_name | File_size |+------------------+-----------+| mysql-bin.000001 | 1357315 || mysql-bin.000002 | 117 || mysql-bin.000003 | 404002 || mysql-bin.0000

This article tells you how to download and delete the mysql binary log (log-bin) in MySQL command mode. If you need it, refer to it. This article tells you how to download and delete the mysql binary log (log-bin) in MySQL command mode. If you need it, refer to it. Find out which binary log files are currently available The Code is as follows: Mysql> show binary logs;+ ---------

As mentioned earlier, I found many external commands on my Mac that have the same name as the Bash internal commands, and in those 24 external commands I found a strange phenomenon: 15 of them were shell scripts, and, oddly enough, they were hard links to the same shell script: $ find/usr/bin-inum 376183/usr/bin/alias/usr/bin/bg/usr/

Modify the user's environment variablesVI ~/. BASHRC Note the alias of line 5th #alias RM='rm-i'The last line adds the following content mkdir-P ~/. Trash alias RM=Trash alias R=Trash alias RL='ls ~/.trash'alias ur=undelfile Undelfile () {MV-I ~/.trash/[email protected].} trash () {MV [email protected]~/.trash/} cleartrash () {Read-P"Clear sure? [N]"Confirm [$confirm=='y'] || [$confirm = ='Y'] /BIN/RM-RF ~/.trash/* }Reload Environment variablesSOUR

The first line of the scripting language is to point out that you want the code in your file to run it with what executable program.For example, the first line of the PHP script can be written in the following formats#!/usr/bin/php#!/usr/bin/env PHP#!/usr/bin/env-s-p/usr/local/bin:/usr/

Deletion and recovery of filesLike the Recycle Bin design for a Linux system, HDFs creates a Recycle Bin directory for each user :/user/ username /. trash/, each file/directory that is deleted by the user through the shell, in the system Recycle Bin is a cycle, that is, when the system in the Recycle Bin files/director