adding the mighty stest.c from dmenu - iomenu - interactive terminal-based selection menu
 (HTM) git clone git://bitreich.org/iomenu git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/iomenu
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       ---
 (DIR) commit b95967e4d0296ca835ced868042b837f840d8019
 (DIR) parent fff2395e59b4a9b4b6a59e7c32345abde0209230
 (HTM) Author: Josuah Demangeon <mail@josuah.net>
       Date:   Thu, 13 Apr 2017 12:51:48 +0200
       
       adding the mighty stest.c from dmenu
       
       Diffstat:
         M .gitignore                          |       1 +
         M Makefile                            |       4 ++--
         A stest.1                             |      90 +++++++++++++++++++++++++++++++
         A stest.c                             |     162 ++++++++++++++++++++++++++++++
       
       4 files changed, 255 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/.gitignore b/.gitignore
       @@ -1 +1,2 @@
        iomenu
       +stest
 (DIR) diff --git a/Makefile b/Makefile
       @@ -1,7 +1,7 @@
        CFLAGS    = -std=c99 -Wpedantic -Wall -Wextra -g # -static 
        OBJ       = ${SRC:.c=.o}
        
       -all: clean iomenu
       +all: clean iomenu stest
        
        clean:
                rm -f iomenu ${OBJ}
       @@ -9,4 +9,4 @@ clean:
        install: iomenu
                mkdir -p  $(PREFIX)/bin $(PREFIX)/man/man1
                cp *.1 $(PREFIX)/man/man1/
       -        cp iomenu $(PREFIX)/bin/
       +        cp iomenu stest $(PREFIX)/bin/
 (DIR) diff --git a/stest.1 b/stest.1
       @@ -0,0 +1,90 @@
       +.TH STEST 1 dmenu\-VERSION
       +.SH NAME
       +stest \- filter a list of files by properties
       +.SH SYNOPSIS
       +.B stest
       +.RB [ -abcdefghlpqrsuwx ]
       +.RB [ -n
       +.IR file ]
       +.RB [ -o
       +.IR file ]
       +.RI [ file ...]
       +.SH DESCRIPTION
       +.B stest
       +takes a list of files and filters by the files' properties, analogous to
       +.IR test (1).
       +Files which pass all tests are printed to stdout. If no files are given, stest
       +reads files from stdin.
       +.SH OPTIONS
       +.TP
       +.B \-a
       +Test hidden files.
       +.TP
       +.B \-b
       +Test that files are block specials.
       +.TP
       +.B \-c
       +Test that files are character specials.
       +.TP
       +.B \-d
       +Test that files are directories.
       +.TP
       +.B \-e
       +Test that files exist.
       +.TP
       +.B \-f
       +Test that files are regular files.
       +.TP
       +.B \-g
       +Test that files have their set-group-ID flag set.
       +.TP
       +.B \-h
       +Test that files are symbolic links.
       +.TP
       +.B \-l
       +Test the contents of a directory given as an argument.
       +.TP
       +.BI \-n " file"
       +Test that files are newer than
       +.IR file .
       +.TP
       +.BI \-o " file"
       +Test that files are older than
       +.IR file .
       +.TP
       +.B \-p
       +Test that files are named pipes.
       +.TP
       +.B \-q
       +No files are printed, only the exit status is returned.
       +.TP
       +.B \-r
       +Test that files are readable.
       +.TP
       +.B \-s
       +Test that files are not empty.
       +.TP
       +.B \-u
       +Test that files have their set-user-ID flag set.
       +.TP
       +.B \-v
       +Invert the sense of tests, only failing files pass.
       +.TP
       +.B \-w
       +Test that files are writable.
       +.TP
       +.B \-x
       +Test that files are executable.
       +.SH EXIT STATUS
       +.TP
       +.B 0
       +At least one file passed all tests.
       +.TP
       +.B 1
       +No files passed all tests.
       +.TP
       +.B 2
       +An error occurred.
       +.SH SEE ALSO
       +.IR dmenu (1),
       +.IR test (1)
 (DIR) diff --git a/stest.c b/stest.c
       @@ -0,0 +1,162 @@
       +/* MIT/X Consortium License
       + *
       + * copyright (c) 2006-2014 Anselm R Garbe <anselm@garbe.us>
       + * copyright (c) 2010-2012 Connor Lane Smith <cls@lubutu.com>
       + * copyright (c) 2009 Gottox <gottox@s01.de>
       + * copyright (c) 2009 Markus Schnalke <meillo@marmaro.de>
       + * copyright (c) 2009 Evan Gates <evan.gates@gmail.com>
       + * copyright (c) 2006-2008 Sander van Dijk <a dot h dot vandijk at gmail dot com>
       + * copyright (c) 2006-2007 MichaƂ Janeczek <janeczek at gmail dot com>
       + * copyright (c) 2014-2015 Hiltjo Posthuma <hiltjo@codemadness.org>
       + *
       + * Permission is hereby granted, free of charge, to any person obtaining a
       + * copy of this software and associated documentation files (the "Software"),
       + * to deal in the Software without restriction, including without limitation
       + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
       + * and/or sell copies of the Software, and to permit persons to whom the
       + * Software is furnished to do so, subject to the following conditions:
       + *
       + * The above copyright notice and this permission notice shall be included in
       + * all copies or substantial portions of the Software.
       + *
       + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
       + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
       + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
       + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
       + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
       + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
       + * DEALINGS IN THE SOFTWARE.
       + */
       +
       +#define _POSIX_C_SOURCE 200809L
       +
       +#include <sys/stat.h>
       +
       +#include <dirent.h>
       +#include <limits.h>
       +#include <stdio.h>
       +#include <stdlib.h>
       +#include <string.h>
       +#include <unistd.h>
       +
       +static char *argv0;
       +
       +#define FLAG(x)  (flag[(x)-'a'])
       +
       +static void test(const char *, const char *);
       +static void usage(void);
       +
       +static int match = 0;
       +static int flag[26];
       +static struct stat old, new;
       +
       +static void
       +test(const char *path, const char *name)
       +{
       +        struct stat st, ln;
       +
       +        if ((!stat(path, &st) && (FLAG('a') || name[0] != '.')        /* hidden files      */
       +        && (!FLAG('b') || S_ISBLK(st.st_mode))                        /* block special     */
       +        && (!FLAG('c') || S_ISCHR(st.st_mode))                        /* character special */
       +        && (!FLAG('d') || S_ISDIR(st.st_mode))                        /* directory         */
       +        && (!FLAG('e') || access(path, F_OK) == 0)                    /* exists            */
       +        && (!FLAG('f') || S_ISREG(st.st_mode))                        /* regular file      */
       +        && (!FLAG('g') || st.st_mode & S_ISGID)                       /* set-group-id flag */
       +        && (!FLAG('h') || (!lstat(path, &ln) && S_ISLNK(ln.st_mode))) /* symbolic link     */
       +        && (!FLAG('n') || st.st_mtime > new.st_mtime)                 /* newer than file   */
       +        && (!FLAG('o') || st.st_mtime < old.st_mtime)                 /* older than file   */
       +        && (!FLAG('p') || S_ISFIFO(st.st_mode))                       /* named pipe        */
       +        && (!FLAG('r') || access(path, R_OK) == 0)                    /* readable          */
       +        && (!FLAG('s') || st.st_size > 0)                             /* not empty         */
       +        && (!FLAG('u') || st.st_mode & S_ISUID)                       /* set-user-id flag  */
       +        && (!FLAG('w') || access(path, W_OK) == 0)                    /* writable          */
       +        && (!FLAG('x') || access(path, X_OK) == 0)) != FLAG('v')) {   /* executable        */
       +                if (FLAG('q'))
       +                        exit(0);
       +                match = 1;
       +                puts(name);
       +        }
       +}
       +
       +static void
       +usage(void)
       +{
       +        fprintf(stderr, "usage: %s [-abcdefghlpqrsuvwx] "
       +                "[-n file] [-o file] [file...]\n", argv0);
       +        exit(2); /* like test(1) return > 1 on error */
       +}
       +
       +int
       +main(int argc, char *argv[])
       +{
       +        struct dirent *d;
       +        char path[PATH_MAX], *line = NULL, *file;
       +        size_t linesiz = 0;
       +        ssize_t n;
       +        DIR *dir;
       +        int r;
       +
       +        for (
       +                argv0 = *argv, argv++, argc--;
       +                argv[0] && argv[0][0] == '-' && argv[0][1];
       +                argv++, argc--
       +        ) {
       +                int brk = 0;
       +
       +                if (argv[0][1] == '-' && argv[0][2] == '\0') {
       +                        argv++,        argc--;
       +                        break;
       +                }
       +
       +                for (argv[0]++; !brk && argv[0][0]; argv[0]++) {
       +                        char f = argv[0][1];
       +
       +                        switch (f) {
       +
       +                        case 'n': /* newer than file */
       +                        case 'o': /* older than file */
       +                                if (argv[0][1] == '\0' && argv[1] == NULL)
       +                                        usage();
       +
       +                                file = (brk = 1, (argv[0][1] != '\0') ?
       +                                        (&argv[0][1]) :        (argc--, argv++, argv[0]));
       +
       +                                if (!(FLAG(f) = !stat(file, (f == 'n' ? &new : &old))))
       +                                        perror(file);
       +                                break;
       +                        default:
       +                                /* miscellaneous operators */
       +                                if (strchr("abcdefghlpqrsuvwx", f))
       +                                        FLAG(f) = 1;
       +                                else
       +                                        usage(); /* unknown flag */
       +                        }
       +                }
       +        }
       +
       +        if (!argc) {
       +                /* read list from stdin */
       +                while ((n = getline(&line, &linesiz, stdin)) > 0) {
       +                        if (n && line[n - 1] == '\n')
       +                                line[n - 1] = '\0';
       +                        test(line, line);
       +                }
       +                free(line);
       +        } else {
       +                for (; argc; argc--, argv++) {
       +                        if (FLAG('l') && (dir = opendir(*argv))) {
       +                                /* test directory contents */
       +                                while ((d = readdir(dir))) {
       +                                        r = snprintf(path, sizeof path, "%s/%s",
       +                                                     *argv, d->d_name);
       +                                        if (r >= 0 && (size_t)r < sizeof path)
       +                                                test(path, d->d_name);
       +                                }
       +                                closedir(dir);
       +                        } else {
       +                                test(*argv, *argv);
       +                        }
       +                }
       +        }
       +        return match ? 0 : 1;
       +}