How to list variables declared in script in bash?

by

set will output the variables, unfortunately it will also output the functions defines as well.

Luckily POSIX mode only outputs the variables:

( set -o posix ; set ) | less

Piping to less, or redirect to where you want the options.

So to get the variables declared in just the script:

( set -o posix ; set ) >/tmp/variables.before
source script
( set -o posix ; set ) >/tmp/variables.after
diff /tmp/variables.before /tmp/variables.after
rm /tmp/variables.before /tmp/variables.after

(Or at least something based on that 🙂 )

More Related Contents:

  1. Why does shell ignore quoting characters in arguments passed to it through variables? [duplicate]
  2. Dynamic variable names in Bash
  3. Expansion of variables inside single quotes in a command in Bash
  4. How to check if a variable is set in Bash
  5. Capturing multiple line output into a Bash variable
  6. Brace expansion with variable? [duplicate]
  7. Bash – variable variables [duplicate]
  8. How to store standard error in a variable
  9. Why does a space in a variable assignment give an error in Bash? [duplicate]
  10. Set environment variables from file of key/value pairs
  11. Using variables inside a bash heredoc
  12. Length of string in bash
  13. How to remove a newline from a string in Bash
  14. What is the difference between “$@” and “$*” in Bash? [duplicate]
  15. Variable containing multiple args with quotes in Bash
  16. Bash script compare two date variables [duplicate]
  17. What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
  18. What is the exact meaning of IFS=$’\n’?
  19. How can I reference a file for variables using Bash?
  20. Bash variables with spaces
  21. Is it possible to build variable names from other variables in bash? [duplicate]
  22. Bash indirect variable referencing
  23. bash variable interpolation separate variables by a hyphen or underscore
  24. How to modify a global variable within a function in bash?
  25. bash background process modify global variable
  26. How to split one string into multiple variables in bash shell? [duplicate]
  27. Divide two variables in bash
  28. bash piping prevents global variable assignment
  29. Left side of pipe is the subshell?
  30. Loop over array, preventing wildcard expansion (*)

Leave a Comment