bash - What are the special dollar sign shell variables ... - Stack ...
2012年9月14日 · In Bash, there appear to be several variables which hold special, consistently-meaning values. For instance, ./myprogram &; echo $! will return the PID of the process …
bash - What is the purpose of "&&" in a shell command? - Stack …
2021年10月27日 · As far as I know, using & after the command is for running it in the background. Example of & usage: tar -czf file.tar.gz dirname & But how about …
shell - Bash regex =~ operator - Stack Overflow
2013年10月18日 · The [[ ]] is treated specially by bash; consider that an augmented version of [ ] construct: [ ] is actually a shell built-in command, which, can actually be implemented as an …
bash - Shell equality operators (=, ==, -eq) - Stack Overflow
If not quoted, it is a pattern match! (From the Bash man page: "Any part of the pattern may be quoted to force it to be matched as a string."). Here in Bash, the two statements yielding "yes" …
arguments - What is $@ in Bash? - Stack Overflow
2010年10月10日 · Yes. Please see the man page of Bash (the first thing you go to) under Special Parameters:. Special Parameters. The shell treats several parameters specially.
linux - What does $@ mean in a shell script? - Stack Overflow
2012年4月3日 · * Note: Word splitting. The shell splits tokens based on the contents of the IFS environment variable. Its default value is \t\n; i.e., whitespace, tab, and newline.
How do AND and OR operators work in Bash? - Stack Overflow
In bash, && and || have equal precendence and associate to the left. See Section 3.2.3 in the manual for details. So, your example is parsed as $ (echo this || echo that) && echo other And …
bash - What does the double-asterisk (**) wildcard mean ... - Stack ...
2022年11月7日 · For example, the bash manual says: Matches any string, including the null string. When the 'globstar' shell option is enabled, and '*' is used in a filename expansion …
What do the -n and -a options do in a bash if statement?
In bash the test command will be a built-in command; try type [to learn its type. For built-in commands help will show usage, so also run help [ to see documentation. Your system …
Which characters need to be escaped when using Bash?
I noticed that Bash automatically escapes some characters when using auto-complete. For example, if you have a directory named dir:A, Bash will auto-complete to dir\:A. Using this, I …