or - conditionally execute a command¶
COMMAND1; or COMMAND2
or is used to execute a command if the previous command was not successful (returned a status of something other than 0).
or does not change the current exit status itself, but the command it runs most likely will. The exit status of the last foreground command to exit can always be accessed using the $status variable.
The following code runs the
make command to build a program. If the build succeeds, the program is installed. If either step fails,
make clean is run, which removes the files created by the build process.
make; and make install; or make clean