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
How would I validate that a program exists, in a way that will either return an error and exit, or continue with the script? It seems like it should be easy, but it’s been stumping me. 3 39
In a Unix shell, if I want to combine stderr and stdout into the stdout stream for further manipulation, I can append the following on the end of my command: 2>&1 So, if I want to use head on the output from g++, I can do something like this: g++ lots_of_errors 2>&1 | head so … Read more
In Bash, tried this: echo -e “Hello,\nWorld!” But it doesn’t print a newline, only \n. How can I make it print the newline? I’m using Ubuntu 11.04 (Natty Narwhal). 20 20 You could use printf instead: printf “hello\nworld\n” printf has more consistent behavior than echo. The behavior of echo varies greatly between different versions.
In PHP, strings are concatenated together as follows: $foo = “Hello”; $foo .= ” World”; Here, $foo becomes “Hello World”. How is this accomplished in Bash? 30 30 foo=”Hello” foo=”${foo} World” echo “${foo}” > Hello World In general to concatenate two variables you can just write them one after another: a=”Hello” b=’World’ c=”${a} ${b}” echo … 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
What command can be used to check if a directory exists or not, within a Bash shell script? 3 36
How do I get the path of the directory in which a Bash script is located, inside that script? I want to use a Bash script as a launcher for another application. I want to change the working directory to the one where the Bash script is located, so I can operate on the files … Read more
