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linux - What does echo $? do? - Unix Linux Stack Exchange In my terminal it printed out a seemingly random number 127 I think it is printing some variable's value and to check my suspicion, I defined a new variable v=4 Running echo $? again gave me 0 as
Difference between printf and echo in bash [duplicate] 84 Both echo and printf are built-in commands (printf is Bash built-in since v2 0 2, 1998) echo always exits with a 0 status, and simply prints arguments followed by an end of line character on the standard output, while printf allows for definition of a formatting string and gives a non-zero exit status code upon failure
bash script creating string from number with plus sign In a bash script, I stumbled over a simple looking problem of creating an expression from a parameter given as number and adding a plus + sign in front of it: YEA= expr $2 \\* 365 echo ${YEA} pl= qu
bash - How does arithmetic expansion work with variables without the . . . man bash, ARITHMETIC EVALUATION describes it as such: Shell variables are allowed as operands; parameter expansion is performed before the expression is evaluated Within an expression, shell variables may also be referenced by name without using the parameter expansion syntax A shell variable that is null or unset evaluates to 0 when referenced by name without using the parameter expansion
Change font in echo command - Unix Linux Stack Exchange Many editors have problems with (char)0x1b Alternatives: copy paste it from somewhere, or use echo -e "\x1b[1m bold" in bash, or a hex editor Or, even simpler: echo -e "\e[1m bold" The \e is an escape sequence for the ascii code 27, for the bash internal command echo as well as for the external program GNU-echo
How to echo a bang! - Unix Linux Stack Exchange You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
bash - What does lt; lt; lt; mean? - Unix Linux Stack Exchange it seems < is for passing file (or directory), << @ for passing multiple lines (similar to the banner command in cisco switches; as terminated by a custom string @ in this case), and <<< to pass a string (instead of file) test them yourself with cat and you'll grasp it very quickly