diff options
Diffstat (limited to 'shell_cmds/printenv')
| -rw-r--r-- | shell_cmds/printenv/printenv.1 | 84 | ||||
| -rw-r--r-- | shell_cmds/printenv/printenv.c | 99 |
2 files changed, 183 insertions, 0 deletions
diff --git a/shell_cmds/printenv/printenv.1 b/shell_cmds/printenv/printenv.1 new file mode 100644 index 0000000..4444375 --- /dev/null +++ b/shell_cmds/printenv/printenv.1 @@ -0,0 +1,84 @@ +.\" Copyright (c) 1980, 1990, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" This code is derived from software contributed to Berkeley by +.\" the Institute of Electrical and Electronics Engineers, Inc. +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)printenv.1 8.1 (Berkeley) 6/6/93 +.\" $FreeBSD$ +.\" +.Dd May 12, 2003 +.Dt PRINTENV 1 +.Os +.Sh NAME +.Nm printenv +.Nd print out the environment +.Sh SYNOPSIS +.Nm +.Op Ar name +.Sh DESCRIPTION +The +.Nm +utility prints out the names and values of the variables in the environment, +with one name/value pair per line. +If +.Ar name +is specified, only +its value is printed. +.Pp +Some shells may provide a builtin +.Nm +command which is similar or identical to this utility. +Consult the +.Xr builtin 1 +manual page. +.Sh EXIT STATUS +.Ex -std +.Sh SEE ALSO +.Xr csh 1 , +.Xr env 1 , +.Xr sh 1 , +.Xr environ 7 +.Sh STANDARDS +The +.Nm +utility is provided for compatibility with earlier +.Bx +and +.Fx +releases and is not specified by any standards. +The functionality of +.Nm +can be duplicated with the +.Xr echo 1 +and +.Xr env 1 +utilities. +.Sh HISTORY +The +.Nm +command appeared in +.Bx 3.0 . diff --git a/shell_cmds/printenv/printenv.c b/shell_cmds/printenv/printenv.c new file mode 100644 index 0000000..315833e --- /dev/null +++ b/shell_cmds/printenv/printenv.c @@ -0,0 +1,99 @@ +/*- + * Copyright (c) 1987, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static const char copyright[] = +"@(#) Copyright (c) 1987, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#if 0 +#ifndef lint +static char sccsid[] = "@(#)printenv.c 8.2 (Berkeley) 5/4/95"; +#endif /* not lint */ +#endif + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +void usage(void); +extern char **environ; + +/* + * printenv + * + * Bill Joy, UCB + * February, 1979 + */ +int +main(int argc, char *argv[]) +{ + char *cp, **ep; + size_t len; + int ch; + + while ((ch = getopt(argc, argv, "")) != -1) + switch(ch) { + case '?': + default: + usage(); + } + argc -= optind; + argv += optind; + + if (argc == 0) { + for (ep = environ; *ep; ep++) + (void)printf("%s\n", *ep); + exit(0); + } + len = strlen(*argv); + for (ep = environ; *ep; ep++) + if (!memcmp(*ep, *argv, len)) { + cp = *ep + len; + if (!*cp || *cp == '=') { + (void)printf("%s\n", *cp ? cp + 1 : cp); + exit(0); + } + } + exit(1); +} + +void +usage(void) +{ + (void)fprintf(stderr, "usage: printenv [name]\n"); + exit(1); +} |