file1 -ef file2: True if file1 and file2 refer to the same device and inode numbers.(两个文件是否指向同一个设备上相同的inode) 文件版本测试 file1 -nt file2: True if file1 is newer (according to modification date) than file2, or if file1 exists and file2 does not. file1 -ot fi...
The script uses a for loop to iterate over a range of numbers from 1 to 20. The loop variable 'i' represents each number in the range. Within the loop, an if statement checks if the current number ('i') is odd using the condition i % 2 != 0. If the condition evaluates to true...
清单6-2。valint,检查有效整数 valint() #@ USAGE: valint INTEGER case ${1#-} in ## Leading hyphen removed to accept negative numbers *[!0-9]*) false;; ## the string contains a non-digit character *) true ;; ## the whole number, and nothing but the number esac 如果函数体用括...
In addition to logical flags there are also logical operators. One of the most useful logical operators is the regex match operator=~. The regex match operator compares a string to a regular expression and if the string is a match for the regex then the expression is equivalent totrue, othe...
In the above code, we use thegawkcommand to process numbers. In particular, we use awhileloop that iterates through each occurrence of a sequence of four or more consecutive digits, surrounded by non-digit characters or the start of the line. ...
The Regular Expression conditional operator =~ takes a string value on the left side and a Bash extended regular expression on the right side of the operator. Syntax: *string1* =~ *regex*. The operator return an exit code 0 (True) if the strings match the regular expression regex. ...
large input file. Suppressing line numbers with the -n option will avoid this problem. Using line numbers means: the line number will be displayed in the verbose prompt and in the = command, and the v command will pass the current line number to the editor (see ...
When it is used, the string to the right of the operator is considered an extended regular expression and matched accordingly (as in regex(3)). The return value is 0 if the string matches the pattern, and 1 otherwise. If the regular expression is syntactically incor‐ ...
TEST 1: test a simple Web Service: Add two numbers: 1+2==3 SOAP_REQ \ 'https://ecs.syr.edu/faculty/fawcett/Handouts/cse775/code/calcWebService/Calc.asmx?WSDL' \ Add `jo a=1 b=2` '.==3' XML Powered byxmltodict. TEST 2: GET XML ...
show example.txt with line numbersnl -s". " example.txt 1. Lorem ipsum 2. dolor sit amet, 3. consetetur 4. sadipscing elitr, 5. sed diam nonumy 6. eirmod tempor 7. invidunt ut labore 8. et dolore magna 9. aliquyam erat, sed 10. diam voluptua. At 11. vero eos et 12...