安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- What are the special dollar sign shell variables? - Stack Overflow
In Bash, there appear to be several variables which hold special, consistently-meaning values For instance, myprogram amp;; echo $! will return the PID of the process which backgrounded myprog
- The UNIX® Standard | www. opengroup. org
Single UNIX Specification- “The Standard” The Single UNIX Specification is the standard in which the core interfaces of a UNIX OS are measured The UNIX standard includes a rich feature set, and its core volumes are simultaneously the IEEE Portable Operating System Interface (POSIX) standard and the ISO IEC 9945 standard
- bash - Shell equality operators (=, ==, -eq) - Stack Overflow
It depends on the Test Construct around the operator Your options are double parentheses, double brackets, single brackets, or test If you use ((…)), you are testing arithmetic equality with == as in C: $ (( 1==1 )); echo $? 0 $ (( 1==2 )); echo $? 1 (Note: 0 means true in the Unix sense and a failed test results in a non-zero number ) Using -eq inside of double parentheses is a syntax
- unix - How to check permissions of a specific directory . . . - Stack . . .
I know that using ls -l "directory directory filename" tells me the permissions of a file How do I do the same on a directory? I could obviously use ls -l on the directory higher in the hierarchy
- unix - How to get PID of process by specifying process name and store . . .
a way to avoid the "grep -v grep" is to use "grep <process nam [e]>" so it interpolates the string and the process nam [e] isn't found when the first grep executes, if that makes sense
- unix - How can I pretty-print JSON in a shell script? - Stack Overflow
I've created an alias: alias pretty='python -mjson tool | pygmentize -l json so that I can just run: command params | pretty Hope this helps PS: Should anyone manages to extend this to a) remove the curl-output I'm seeing every time and or b) NOT sort the json keys; please do let me know, I will be highly thankful
- bash - How can I split a large text file into smaller files with an . . .
I've got a large (by number of lines) plain text file that I'd like to split into smaller files, also by number of lines So if my file has around 2M lines, I'd like to split it up into 10 files t
- How can I convert a Unix timestamp to DateTime and vice versa?
A Unix tick is 1 second (if I remember well), and a NET tick is 100 nanoseconds If you've been encountering problems with nanoseconds, you might want to try using AddTick (10000000 * value)
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