This is denoted as statement2 in the function syntax. An important thing to keep in mind is that, like C programming, shell scripting is case sensitive. Hence, you need to be careful while using the keywords in your code. How to use if-else in shell script It is easy to see the ...
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In this tutorial,we’ll explore how to constructif–elsestatements on a single line. First, we look at Bash one-liners in general. Next, we do a brief refresher of conditional statements in terms of their structure and potential to stretch on multiple lines. After that, we get into compa...
Conditional statements help in deciding the proper execution path for operations. Unix/Linux Shell supports two conditional statements: The if...else statement The case...esac statement Control statements are used to indicate how the control is transferred during the program execution....
/bin/kshgrep$NAME filenameif[ $? -eq0]echo"Name Found"elseecho"Name not Found"fi The $? holds the exit status of the previously executed command. Check the man page please. 来源:https://www.unix.com/shell-programming-and-scripting/30996-using-grep-if-statement.html...
else echo "Sorry, you are not eligible for a scholarship." fi Nested If statement In your bash script, you have the flexibility to incorporate multiple if statements as needed. Furthermore, it is entirely possible to nest an if statement within another if statement, creating what is referred...
‘if condition’, then compared with ‘else-if’ conditions. Here, it is noted that once any condition is matched, ‘if-else-if’ condition terminates. Here, if no ‘if’ or ‘else if’ is matched, then at last ‘else’ condition is executed which we can see in above output when ...
Awk If Else If ladder if(conditional-expression1) action1; else if(conditional-expression2) action2; else if(conditional-expression3) action3; . . else action n; If the conditional-expression1 is true then action1 will be performed.
grep #!/bin/kshgrep$NAME filenameif[ $? -eq0]echo"Name Found"elseecho"Name not Found"fi 1. 2. 3. 4. 5. 6. 7. The $? holds the exit status of the previously executed command. Check the man page please. 来源:https://www.unix.com/shell-programming-and-scripting/30996-using-gre...
最后是靠Advanced Bash-Scripting Guide这本书搞清楚的。 条件部分的意义 很多教程都这么说:condition的代码执行后,如果结果为 true,就继续执行then部分,否则继续执行else部分。跟其它语言的一样的,没区别,例如[ -f file ]判断文件是否存在,文件存在就是 true 了,不存在就是 false 了。