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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 which backgrounded myprog...
bash - What are the special dollar sign shell variables ... - Stack ... Here-strings in bash are implemented via temporary files, usually in the format /tmp/sh-thd., which are later unlinked, thus making them occupy some memory space temporarily but not show up in the list of /tmp directory entries, and effectively exist as anonymous files, which may still be referenced via file descriptor by the ...
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bash - What is the purpose of "&&" in a shell command? - Stack Overflow What is the operator =~ called? I'm not sure it has a name. The bash documentation just calls it the =~ operator. Is it only used to compare the right side against the left side? The right side is considered an extended regular expression. If the left side matches, the operator returns 0, and 1 otherwise. Why are double square brackets required when running a test? Because =~ is an operator of ... For understanding bash code it is usually very helpful to set the -x option: set -x # within a script / function or when calling a script: bash -vx ./script.sh With loops this is a little less helpful. But you can always take the first part of the command and do this: echo for url in $(cat example.txt) That shows you what happens there (at least the result). This feature is called "command ...
bash - What does $ ( ... ) mean in the shell? - Unix & Linux Stack Exchange The reason is that Bash is untyped. The -eq causes the strings to be interpreted as integers if possible including base conversion: ... And 0 if Bash thinks it is just a string: ... So [[ "yes" -eq "no" ]] is equivalent to [[ 0 -eq 0 ]] Last note: Many of the Bash specific extensions to the Test Constructs are not POSIX and therefore may fail ... Furthermore, when you use bash -c, behavior is different than if you run an executable shell script, because in the latter case the argument with index 0 is the shell command used to invoke it. However in Bash, introducing a pipe means the individual commands are run in subshells. Consider this: ... The output of the 2nd echo command prints just a single space. Whaaaa? What happened to my variables? Because the read command is in a pipeline, it is run in a subshell. It correctly reads 2 words from its stdin and assigns to the variables. bash - What does <<< mean? - Unix & Linux Stack Exchange
In general, in bash and other shells, you escape special characters using \. So, when you use echo foo >\> what you are saying is "redirect to a file called > ", but that is because you are escaping the second >. It is equivalent to using echo foo > \> which is the same as echo foo > '>'. So, yes, as Sirex said, that is likely a typo in your book. bash - Difference between >> and - Unix & Linux Stack Exchange From the manual: (acessible by calling man bash in your shell) ? Expands to the exit status of the most recently executed foreground pipeline. By convention an exit status of 0 means success, and non-zero return status means failure. Learn more about exit statuses on wikipedia. 3 I accidentally replaced my ~/.bash_profile with an empty file. My usually colored screen has turned black and white. (I'm running in command-line-mode with Raspbian Stretch Lite). How do I reset this file? How to hide secret information with .bash_profile Ask Question Asked 6 years, 1 month ago Modified 6 years, 1 month ago Have a look at this question which explains the difference between .bashrc and .bash_profile. X11 will look at your .bashrc while a "regular" Terminal will look at .bash_profile So you will need to use .bash_profile in your case. EDIT: If the new PATH is exported via .bash_profile, the changes are not effective immediately. Try I know this question has been asked before, but I can't find a fix for my problem, I just can't get my script to run on startup. Here's my script: #!/bin/bash iptables -A INPUT -m state --state NE... in your case it would probably be xmodmap -e 'keycode 66=Escape'. by the way: if you don't want to type the command every time you login manually, you can insert the line into your .bash_profile and it is executed automatically with your login. If you set MY_ENV_VAR in your .bash_profile, it will be set if you login as pi but it will not be set if you start a non-interactive shell as in ssh pi@raspberry.local python ./myscript or a subshell as in sudo -u pi bash.
