unix shell scripting tutorial pdf

Scripting programming languages and compiled languages: Scripting programming Language: (Bash) The scripting language is usually interpreted (interpreted), which is read into the program code primarily by the interpreter (interpreter) and is translated into an internal form for execution. Advantages: can easily handle objects such as files and directories. D

From a programmer's point of view, the shell itself is a program written in C language, from the user's point of view, the shell is the user and the Linux operating system communication Bridge. Users can either enter command execution and use shell scripting to accomplish more complex operations. In the Linux GUI incre

, The interpreter (interpreter) needs to read the source code that we wrote and convert it to the target (object), which is then run by the computer. Because each execution of the program is more than the compilation process, so efficiency has decreased.The advantage of using scripting languages is that they are mostly run at a higher level than the compiled language and can easily handle objects such as files and directories, and the disadvantage is

# input Check:If [-Z ']; ThenError "Error:you must specify a file, use-h for help"FiFilen= "$"# Rename any. 1,. 2 etc File:For N in 9 8 7 6 5 4 3 2 1; DoIf [-F ' $filen. $n "]; Thenp= ' expr $n + 1 'echo "MV $filen. $n $filen. $p"MV $filen. $n $filen. $pFiDone# Rename the original file:If [-F "$filen"]; Thenecho "MV $filen $filen. 1"MV $filen $filen. 1Fiecho Touch $filenTouch $filenHow does this script work? After detecting a file name provided by the user, we perform a 9 to 1 loop. File 9 is na

script rotatefile can solve this problem. This script can rename the message to save the file (assuming outmail) is OUTMAIL.1, and for outmail.1 it becomes outmail.2 and so on ... The code is as follows: #!/bin/sh # vim: set sw=4 ts=4 et: ver="0.1" help() {   cat How does this script work? After detecting a file name provided by the user, we perform a 9 to 1 loop. File 9 is named 10, file 8 is renamed to 9, and so on. After the loop is complete, we name the original file 1

Use PHP as the Shell scripting language. We all know that PHP is a very good dynamic web page development language (fast speed, short development cycle ......). However, only a few people realize that PHP can also be well written. we all know that PHP is a very good dynamic web page development language (fast speed, short development cycle ......). However, only a few people realize that PHP can also be a g

shell script will output on the display:Hello, Darrell brogdon! How is you today?[Dbrogdon@artemis dbrogdon]$PHP also contains the "$ARGV" array when it is written as a dynamic Web page, but there are some differences: when PHP is the Shell scripting language, "$argv [0]" corresponds to the file name of the script, and when used for dynamic Web page writing, "$a

As we all know, PHP (as the current mainstream development language) is a very good dynamic web development language (fast, short development cycle ...). ）。 But only a very small number of people realize that PHP (as the current mainstream development language) can also be very good as the language of writing shell scripts, when PHP (as the current mainstream development language) as the language of writing shell