Menu
Here are the different ways to store the output of a command in shell script. You can also use these commands on terminal to store command outputs in shell variables. variable_name=$(command) variable_name=$(command [option ...] arg1 arg2 ...) OR variable_name=`command` variable_name=`command [option ...]
the shortcut is Ctrl + Shift + S ; it allows the output to be saved as a text file, or as HTML including colors!
To find out if a bash variable is empty: Return true if a bash variable is unset or set to the empty string: if [ -z "$var" ]; Another option: [ -z "$var" ] && echo "Empty" Determine if a bash variable is empty: [[ ! -z "$var" ]] && echo "Not empty" || echo "Empty"
Increment Bash Variable with += Operator Another common operator which can be used to increment a bash variable is the += operator. This operator is a short form for the sum operator. The first operand and the result variable name are the same and assigned with a single statement.
Quote your variables. Here is it why:
$ f="fafafda
> adffd
> adfadf
> adfafd
> afd"
$ echo $f
fafafda adffd adfadf adfafd afd
$ echo "$f"
fafafda
adffd
adfadf
adfafd
afd
Without quotes, the shell replaces $TEMP with the characters it contains (one of which is a newline). Then, before invoking echo shell splits that string into multiple arguments using the Internal Field Separator (IFS), and passes that resulting list of arguments to echo. By default, the IFS is set to whitespace (spaces, tabs, and newlines), so the shell chops your $TEMP string into arguments and it never gets to see the newline, because the shell considers it a separator, just like a space.
I have ran into the same problem, a quote will help
ubuntu@host:~/apps$ apps="abc
> def"
ubuntu@host:~/apps$ echo $apps
abc def
ubuntu@host:~/apps$ echo "$apps"
abc
def
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With