if then command

Click Back to learn the path of the Linux command line and shell script12.1-Structured Command If-thenMany programs require some logical process control over the commands in shell scripts. A class of commands will cause the script to skip certain

Test File OPERATOR: -B file: if the file is a special file, it is true. -C file: if the file is a special character file, it is true. -D file: if the file is a directory, it is true. -E file: true if the file exists -F file: if the file is a normal

The Java.lang.Runtime class makes it easy to invoke the operating system commands, or an executable program, the following small example I tested in Windows and Linux separately, both passed. The rationale is to first return the run-time object

The distributed command mode is a recommended mode for architecture design. Compared with the design of common applications, it should be considered more in the interconnected system. The goal of this model is to have the same design for both an

Note content:L 8.10 Shell special symbol cut command L 8.11 sort_wc_uniq command L 8.12 tee_tr_split command L 8.13 Shell special symbol Note Date:2017.8.168.10 Shell special symbol cut command Special symbols:1.* Any arbitrary character wildcard

Design Mode-command modeOverview In software development, we often need to send requests (call one or some methods) to some objects, but we do not know who the request receiver is, we do not know which operation is requested. At this time, we

Sudo command: if you use a Linux Command, the following error occurs: sudolinux Have you ever received the "Permission denied" error message when running Linux commands? This may be because you are trying to perform an operation that requires the

Note: These are common Modem commands. Some commands may not apply to all modem instances. If any problem occurs, see the modem documentation or contact the modem manufacturer's Technical Support Department. All commands (with two exceptions) must

The conditional judgment statement in the shell is an upgrade to the previous "conditional test statement in the shell", meaning that the preceding test statement serves the IF~THEN~FI statement for the current judgment statement.We're still rolling

When you use commands to delete a DB2 database and create a new database, there are often database alias errors. There are two possible causes of this error: 1. this database exists in the system database directory. You can see in the control center