How should reverse quotes be used in Linux?
In Linux, backticks (`) can be used to execute commands and assign their results as strings to variables, output to the terminal or pass to other commands. Here is how backticks are used:
- Assign the output of the command to a variable.
result=`command`
For example, assign the list of files in the current directory to the variable “files”:
files=`ls`
- “Display the command output on the terminal.”
echo `command`
For example, output the current date to the terminal.
echo `date`
- Pass the output of a command to another command.
command1 `command2`
For example, passing a list of files to the grep command to search for files with a specific pattern:
grep "pattern" `ls`
It is worth noting that in newer versions of Linux, it is recommended to use $() instead of backticks, as it offers better readability and nesting capabilities. The above usage can also be replaced with $().
result=$(command)
echo $(date)
grep "pattern" $(ls)
