Lookup shell variables by name, indirectly [duplicate]

by

From the man page of bash:

${!varname}

If the first character of parameter is an exclamation point, a level of
variable indirection is introduced. Bash uses the value of the variable formed from the rest of parameter as the name of the variable;
this variable is then expanded and that value is used in the rest of
the substitution, rather than the value of parameter itself. This is
known as indirect expansion.

More Related Contents:

  1. Indirect variable assignment in bash
  2. How to modify a global variable within a function in bash?
  3. I can’t seem to use the Bash “-c” option with arguments after the “-c” option string
  4. Command not found error in Bash variable assignment
  5. Why does shell ignore quoting characters in arguments passed to it through variables? [duplicate]
  6. Why should eval be avoided in Bash, and what should I use instead?
  7. How can I use a file in a command and redirect output to the same file without truncating it?
  8. How to check if a variable is set in Bash
  9. Why does a space in a variable assignment give an error in Bash? [duplicate]
  10. Return value in a Bash function
  11. Shell equality operators (=, ==, -eq)
  12. What is a simple explanation for how pipes work in Bash?
  13. Shell script to delete directories older than n days
  14. Error when using ‘sed’ with ‘find’ command on OS X: “invalid command code .”
  15. How to check the exit status using an ‘if’ statement
  16. Best way to make a shell script daemon?
  17. What does -z mean in Bash? [duplicate]
  18. Longest line in a file
  19. Parse Date in Bash
  20. Simple method to shuffle the elements of an array in BASH shell?
  21. Grepping a huge file (80GB) any way to speed it up?
  22. Launch Google Chrome from the command line with specific window coordinates
  23. What does “plus colon” (“+:”) mean in shell script expressions?
  24. How does AND and OR operators work in Bash?
  25. How to split one string into multiple variables in bash shell? [duplicate]
  26. How to effectively abort the execution of a Bash script from a function
  27. How can I check if a package is installed and install it if not?
  28. Get the name of the caller script in bash script
  29. How does testing if a string is ‘greater’ than another work in Bash?
  30. What is the shortest way to get n-th column of an output?

Leave a Comment