Fish equivalent of bash $(command) notation
In fish, $ is used only for variables. Correct notation equivalent to bash $(command) is just (command) in fish.
command-substitution
How to avoid bash command substitution to remove the newline character?
Non-trailing newlines are not removed The newlines you are looking for are there, you just don’t see them, because you use echo without quoting the variable. Validation: $ a=$( df -H ) $ echo $a Filesystem Size Used Avail Use% Mounted on /dev/sda3 276G 50G 213G 19% / udev 2.1G 4.1k 2.1G 1% /dev tmpfs … Read more
Backticks vs braces in Bash
The “ is called Command Substitution and is equivalent to $() (parenthesis), while you are using ${} (curly braces). So all of these expressions are equal and mean “interpret the command placed inside”: joulesFinal=`echo $joules2 \* $cpu | bc` joulesFinal=$(echo $joules2 \* $cpu | bc) # v v # ( instead of { v # … Read more
How do I assign the output of a command into an array?
To assign the output of a command to an array, you need to use a command substitution inside of an array assignment. For a general command command this looks like: arr=( $(command) ) In the example of the OP, this would read: arr=($(grep -n “search term” file.txt | sed ‘s/:.*//’)) The inner $() runs the … Read more