I have this string stored in a variable: IN=”[email protected];[email protected]” Now I would like to split the strings by ; delimiter so that I have: ADDR1=”[email protected]” ADDR2=”[email protected]” I don’t necessarily need the ADDR1 and ADDR2 variables. If they are elements of an array that’s even better. After suggestions from the answers below, I ended up with … Read more
I’ve used the following script to see if a file exists: #!/bin/bash FILE=$1 if [ -f $FILE ]; then echo “File $FILE exists.” else echo “File $FILE does not exist.” fi What’s the correct syntax to use if I only want to check if the file does not exist? #!/bin/bash FILE=$1 if [ $FILE does … Read more
This is really non-trivial. There are two ways to sandbox Python. One is to create a restricted environment (i.e., very few globals etc.) and exec your code inside this environment. This is what Messa is suggesting. It’s nice but there are lots of ways to break out of the sandbox and create trouble. There was … Read more
In a Bash script, how can I exit the entire script if a certain condition occurs?
This is the exit status of the last executed command. For example the command true always returns a status of 0 and false always returns a status of 1: true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) $? Expands to the exit status of the most recently executed foreground … Read more
First, any time you run a script using the interpreter explicitly, as in $ python ./my_script.py $ ksh ~/bin/redouble.sh $ lua5.1 /usr/local/bin/osbf3 the #! line is always ignored. The #! line is a Unix feature of executable scripts only, and you can see it documented in full on the man page for execve(2). There you will find that the word following #! must be the … Read more
Difference between a script and a program?
