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What is the $? (dollar question mark) variable in shell scripting? 344 $? is used to find the return value of the last executed command Try the following in the shell: ls somefile echo $? If somefile exists (regardless whether it is a file or directory), you will get the return value thrown by the ls command, which should be 0 (default "success" return value)
regex - Meaning of =~ operator in shell script - Stack Overflow An additional binary operator, =~, is available, with the same precedence as == and != 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
Difference between $ {} and $ () in a shell script - Super User 76 $(command) is “command substitution” As you seem to understand, it runs the command, captures its output, and inserts that into the command line that contains the $(…); e g , ${parameter} is “parameter substitution” A lot of information can be found in the shell’s man page, bash (1), under the “ Parameter Expansion ” heading:
How to highlight bash shell commands in markdown? shell or similar for CLI commands, highlighting with different colors the main command sub-commands, arguments, strings, etc console, shellsession, bash session or similar for shell sessions (prompt + command + output) For shell sessions, here are the common references for the most common syntax highlight libraries: Rouge (github)) uses console
bash - How to use shell commands in Makefile - Stack Overflow FILES := $(shell ) # expand now; FILES is now the result of $(shell ) FILES = $(shell ) # expand later: FILES holds the syntax $(shell ) If you use the = assignment, it means that every single occurrence of $(FILES) will be expanding the $(shell ) syntax and thus invoking the shell command This will make your make job run slower
What is the meaning of $? in a shell script? - linux This latter usage is faster, does not contaminate the shell's variable namespace with what amounts to temp variables, can often be a lot more readable for humans and encourages the use of "positive logic", the practice of writing conditionals without negations, which has cognitive simplicity in most situations
shell - Difference between sh and Bash - Stack Overflow Shell - "Shell" is a program, which facilitates the interaction between the user and the operating system (kernel) There are many shell implementations available, like sh, Bash, C shell, Z shell, etc Using any of the shell programs, we will be able to execute commands that are supported by that shell program Bash - It derived from Bourne
What is the purpose of in a shell command? - Stack Overflow In shell, when you see $ command one command two the intent is to execute the command that follows the only if the first command is successful This is idiomatic of Posix shells, and not only found in Bash It intends to prevent the running of the second process if the first fails
What is the difference between shell, console, and terminal? The shell is the program which actually processes commands and returns output Most shells also manage foreground and background processes, command history and command line editing These features (and many more) are standard in bash, the most common shell in modern linux systems A terminal refers to a wrapper program which runs a shell