Table of Contents

unix Keyword 1

File Removal

Definition

File removal also known as file deletion is a way of removing a file from a computer's file system.

The reasons for deleting files are

  Freeing the disk space
  Removing duplicate or unnecessary data to avoid confusion
  Making sensitive information unavailable to others

All operating systems include commands for deleting files (rm on Unix, era in CP/M and DR-DOS, del/erase in MS-DOS/PC DOS, DR-DOS, Microsoft Windows etc.). File managers also provide a convenient way of deleting files. Files may be deleted one-by-one, or a whole directory tree may be deleted.

References

unix Keyword 1 Phase 2

Variable (environment / local)

Definition

Environment variable - within the shell, a variable that is stored in the environment. Because the environment is inherited by all child processes, environment variables can be thought of as global variables. However, they are not strictly global, because changes made by the child are not propagated back to the parent. Local Variable - A variable that exists only within the scope in which it was created. For example. within the shell, a variable that is not part of the environment is a local variable.

References