How to pass variables from one shell to another?
$ ./a.sh The message is: hello This more or less “imports” the contents of b.shdirectly and executes it in the same shell. Notice that we didn’t have to export the variable to access it. This implicitly shares all the variables you have, as well as allows the other script to add/delete/modify variables in the shell.
Why is it not possible to export from a shell script?
You can’t do an export through a shell script, because a shell script runs in a child shell process, and only children of the child shell would inherit the export. The reason for using source is to have the current shell execute the commands.
How to save variables between runs of a script?
@Rodrigo I’ve used a similar approach before for “saving” values between runs of a script with some success. Just one thing to keep in mind, is that if multiple instances of the scripts run, things might get dicey. But if you save them in bash assignment form, you can just source the file to import the variables– FatalErrorMar 19 ’12 at 18:22
How to set an environment variable in Bash?
To use exportto set an environment variable, you can either use an existing variable: A=10 # export A This ought to work in both bashand sh. bashalso allows it to be combined like so: export A=10 This also works in mysh(which happens to be bash, you can use echo $SHELLto check).
How to pass data between separately running Python scripts?
If I have a python script running (with full Tkinter GUI and everything) and I want to pass the live data it is gathering (stored internally in arrays and such) to another python script, what would be the best way of doing that?
Which is the best way to pass data in Python?
As Akshay Apte said in his answer, the best part about using pipes/queues, is that you can pass python objects through them. Also, there are methods to avoid waiting for data, if there hasn’t been any passed yet ( queue.empty () and pipeConn.poll () ).
How to pass a variable to an SH child process?
– Unix & Linux Stack Exchange Closed 8 years ago. How to “send” variable to sub-shell? I have a bash script and inside that script I do sh. How to pass a variable to the new shell?
How to read a file into a variable in shell?
In cross-platform, lowest-common-denominator sh you use: #!/bin/sh value=`cat config.txt` echo “$value” In bash or zsh, to read a whole file into a variable without invoking cat: #!/bin/bash value=$ (