In addition to backticks `command`, command substitution can be done with $(command) or “$(command)”, which I find easier to read, and allows for nesting. Quoting (“) does matter to preserve multi-line variable values; it is optional on the right-hand side of an assignment, as word splitting is not performed, so OUTPUT=$(ls -1) would work fine.
I figured it out now. When you need to run two commands in exec in a find you need to actually have two separate execs. This finally worked for me.
You could do this, which facilitates reading: >&2 copies file descriptor #2 to file descriptor #1. Therefore, after this redirection is performed, both file descriptors will refer to the same file: the one file descriptor #2 was originally referring to. For more information see the Bash Hackers Illustrated Redirection Tutorial.
cat 1.txt – | ./game This cat is pointless, you could just as easily do this: ./game < 1.txt. Which can also be used to run the game under GDB: See also this answer.
I have a shell script with this code: But the conditional code always executes, because hg st always prints at least one newline character. Is there a simple way to strip whitespace from $var (like trim() in PHP)? or Is there a standard way of dealing with this issue? I could use sed or AWK, but I’d like to think there is a more elegant … Read more
Try ssh -t -t(or ssh -tt for short) to force pseudo-tty allocation even if stdin isn’t a terminal. See also: Terminating SSH session executed by bash script From ssh manpage:
To match regexes you need to use the =~ operator. Try this: Alternatively, you can use wildcards (instead of regexes) with the == operator: If portability is not a concern, I recommend using [[ instead of [ or test as it is safer and more powerful. See What is the difference between test, [ and [[ ? for details.
Try following these if these might help: Since your installation works on the terminal you installed, all the exports you did, work on the current bash and its child process. but is not spawned to new terminals. env variables are lost if the session is closed; using .bash_profile, you can make it available in all sessions, since when a bash session starts, it … Read more
On my local machine, I run a python script which contains this line This works fine. Then I run the same code on a server and I get the following error message So what I did then is I inserted a print bashCommand which prints me than the command in the terminal before it runs it with os.system(). … Read more
-z string True if the string is null (an empty string)