linux comparison operators

use the If statement to determine parameters in Linux shell programming–b when file exists and is a block file returns true-D when file exists and is a character file returns True-e when pathname exists and is a directory returns true-F when a file

File comparison Operators-e filename true if filename exists [-e/var/log/syslog]-D filename true If filename is a directory [-d/tmp/mydir]-F filename true If filename is a regular file [-f/usr/bin/grep]-L filename true If filename is a

Java basics: Comparison of equals and & quot; operators-Linux general technology-Linux programming and kernel information. For more information, see the following. The equals method is a method of the Object class. All classes inherited from the

The logical operators of the shell involve the following types, so as long as the appropriate choice, can solve our many complex judgments, to achieve a multiplier effect. first, the logical operator Logical Volume Label

Operator Describe Example File comparison Operators -e filename True if filename exists [-e/var/log/syslog] -D filename True if filename is a directory [-d/tmp/mydir]

The logical operators of the shell involve the following types, so as long as the appropriate choice, can solve our many complex judgments, to achieve a multiplier effect.First, the logical operator Logical Volume Label Express

The logical operators of the shell involve the following types, so as long as the appropriate choice, can solve our many complex judgments, to achieve a multiplier effect.First, the logical operator Logical Volume Label Express

The Shell is basically a command interpreter, similar to a DOS command. It receives user commands (such as LS, and so on), and then invokes the appropriate application. The more common shell has the standard Bourne shell (SH) and C shell (CSH).Many

The logical operators of the shell involve the following types, so as long as the appropriate choice, can solve our many complex judgments, to achieve a multiplier effect.First, the logical operator Logical Volume Label Express

1.python encoding Formatpython2：ASCIIpython3：UnicodeASCII encoding:1 bytes (bytes) = 8 bits (bit) an English character takes one byte,Unicode:Usually a character is stored in two bytes, either English or Chinese, and the English is 0 in front. If