Each operator and operand must beĪ separate argument. Return a status of 0 or 1 depending on the evaluation of theĬonditional expression expr. If you look through the Bash man page you'll find the details on it. If that function is not defined, the shell prints an error message and returns an exit status of 127.

If that function exists, it is invoked with the original command and the original command's arguments as its arguments, and the function's exit status becomes the exit status of the shell. If the search is unsuccessful, the shell searches for a defined shell function named command_not_found_handle. A full search of the directories in PATH is performed only if the command is not found in the hash table. Bash uses a hash table to remember the full pathnames of executable files (see hash under SHELL BUILTIN COMMANDS below). If the name is neither a shell function nor a builtin, and contains no slashes, bash searches each element of the PATH for a directory containing an executable file by that name. If a match is found, that builtin is invoked.

If the name does not match a function, the shell searches for it in the list of shell builtins. If there exists a shell function by that name, that function is invoked as described above in FUNCTIONS. #sudo -u jboss sh $ time ]īuiltins - If the command name contains no slashes, the shell attempts to locate it. # as well as add the appropriate executables to $PATH. # Include some script files in order to set and export environmental variables # Short-Description: Start/Stop JBoss AS 7 # Required-Stop: $local_fs $remote_fs $network $syslog # Required-Start: $local_fs $remote_fs $network $syslog As far as I know, square brackets are used to enclose an expression usually in if else statements.īut I found square brackets being used without the 'if' as follows: &.

Brackets ubuntu