Z:gnu-bash--ebfa0c-Evaluate conditional expressio/en

Evaluate conditional expression. Exits with a status of 0 (true) or 1 (false) depending on   the evaluation of EXPR. Expressions may be unary or binary. Unary expressions are often used to examine the status of a file. There are string operators and numeric comparison operators as well. The behavior of test depends on the number of arguments. Read the bash manual page for the complete specification. File operators: -a FILE       True if file exists. -b FILE       True if file is block special. -c FILE       True if file is character special. -d FILE       True if file is a directory. -e FILE       True if file exists. -f FILE       True if file exists and is a regular file. -g FILE       True if file is set-group-id. -h FILE       True if file is a symbolic link. -L FILE       True if file is a symbolic link. -k FILE       True if file has its `sticky' bit set. -p FILE       True if file is a named pipe. -r FILE       True if file is readable by you. -s FILE       True if file exists and is not empty. -S FILE       True if file is a socket. -t FD         True if FD is opened on a terminal. -u FILE       True if the file is set-user-id. -w FILE       True if the file is writable by you. -x FILE       True if the file is executable by you. -O FILE       True if the file is effectively owned by you. -G FILE       True if the file is effectively owned by your group. -N FILE       True if the file has been modified since it was last read. FILE1 -nt FILE2 True if file1 is newer than file2 (according to                       modification date). FILE1 -ot FILE2 True if file1 is older than file2. FILE1 -ef FILE2 True if file1 is a hard link to file2. String operators: -z STRING     True if string is empty. -n STRING STRING     True if string is not empty. STRING1 = STRING2 True if the strings are equal. STRING1 != STRING2 True if the strings are not equal. STRING1 < STRING2 True if STRING1 sorts before STRING2 lexicographically. STRING1 > STRING2 True if STRING1 sorts after STRING2 lexicographically. Other operators: -o OPTION     True if the shell option OPTION is enabled. -v VAR	 True if the shell variable VAR is set -R VAR	 True if the shell variable VAR is set and is a name reference. ! EXPR        True if expr is false. EXPR1 -a EXPR2 True if both expr1 AND expr2 are true. EXPR1 -o EXPR2 True if either expr1 OR expr2 is true. arg1 OP arg2  Arithmetic tests. OP is one of -eq, -ne, -lt, -le, -gt, or -ge. Arithmetic binary operators return true if ARG1 is equal, not-equal, less-than, less-than-or-equal, greater-than, or greater-than-or-equal than ARG2. Exit Status: Returns success if EXPR evaluates to true; fails if EXPR evaluates to   false or an invalid argument is given.