Shell中exit和return的区别讲解

exit [<n>]

#define EX_OK      0    /* successful termination */
#define EX__BASE    64   /* base value for error messages */
#define EX_USAGE    64   /* command line usage error */
#define EX_DATAERR   65   /* data format error */
#define EX_NOINPUT   66   /* cannot open input */
#define EX_NOUSER    67   /* addressee unknown */
#define EX_NOHOST    68   /* host name unknown */
#define EX_UNAVAILABLE 69   /* service unavailable */
#define EX_SOFTWARE   70   /* internal software error */
#define EX_OSERR    71   /* system error (e.g., can't fork) */
#define EX_OSFILE    72   /* critical OS file missing */
#define EX_CANTCREAT  73   /* can't create (user) output file */
#define EX_IOERR    74   /* input/output error */
#define EX_TEMPFAIL   75   /* temp failure; user is invited to retry */
#define EX_PROTOCOL   76   /* remote error in protocol */
#define EX_NOPERM    77   /* permission denied */
#define EX_CONFIG    78   /* configuration error */
#define EX__MAX 	   78   /* maximum listed value */

#!/bin/bash
if [ $# -ne 1 ]
then
 echo "please input parameter"
  return 1
fi