This is a test of PHP's ability to execute shell commands.
`ls`
DOMinnerHTML.html
HEADER.html
README.html
Text
Text_Highlighter
ahovercolor.html
anchors.html
b2antispam_genhtaccess.php
b2antispam_genhtaccess.php.txt
b2antispam_htaccess.php
blacklists_prune.php.txt
casino-tranny-baccarat.html
clickstealer.html
cookieprototype.html
corners-heavy.png
dls.html
dtr
edges-heavy.png
error_log
exec.php
filename.php
firstline.html
flash.js
flashdetector.html
floattest.html
framer.html
fsockopen.php
highlight
hoverli.html
htaccess
ical
image_gallery
import-b2evolution.php
insetoutset.html
keepYaLinksPoppin.js
landscape.html
life
manager
multi-selector-test.html
name_to_color.php
not_tables.css
not_tables.html
objects.html
objects.php
passing_nodes_between_frames
remote_fopen.php
reserved.php
scriptsniff.php
sierpinski.html
smbh
smbh.html
standardspoppin.html
syntax.php
test.htaccess.txt
test.txt
text-shadow.html
threecol_123.php
window.external.html
window_focus
wp-contactform.php
`ls -author -l --file-type -s`
total 436K
4.0K -rw-r--r--  1 root 1.5K Nov 20  2015 scriptsniff.php
4.0K -rw-r--r--  1 root  809 Nov 20  2015 .htaccess
   0 -rw-r--r--  1 root    0 Nov 20  2015 error_log
8.0K -rw-r--r--  1 root 8.0K Nov 20  2015 b2antispam_genhtaccess.php
4.0K -rw-r--r--  1 root 2.5K Nov 20  2015 b2antispam_htaccess.php
4.0K -rw-r--r--  1 root 1.1K Nov 24  2015 exec.php
4.0K -rw-r--r--  1 root   22 Nov 24  2015 filename.php
8.0K -rw-r--r--  1 root 6.6K Nov 24  2015 fsockopen.php
 28K -rw-r--r--  1 root  25K Nov 24  2015 import-b2evolution.php
4.0K -rw-r--r--  1 root 2.2K Nov 24  2015 name_to_color.php
8.0K -rw-r--r--  1 root 7.2K Nov 24  2015 objects.php
4.0K -rw-r--r--  1 root 1.6K Nov 24  2015 remote_fopen.php
 28K -rw-r--r--  1 root  27K Nov 24  2015 reserved.php
 28K -rw-r--r--  1 root  27K Nov 24  2015 syntax.php
4.0K -rw-r--r--  1 root 1.5K Nov 24  2015 threecol_123.php
 12K -rw-r--r--  1 root  11K Nov 24  2015 wp-contactform.php
 20K -rw-r--r--  1 root  17K Dec 13 02:35 anchors.html
4.0K drwxr-xr-x 14 root 4.0K Dec 13 02:35 ./
4.0K -rw-r--r--  1 root 1.9K Dec 13 02:35 DOMinnerHTML.html
8.0K -rw-r--r--  1 root 5.2K Dec 13 02:35 HEADER.html
4.0K -rw-r--r--  1 root 1.3K Dec 13 02:35 README.html
4.0K -rw-r--r--  1 root 1.6K Dec 13 02:35 ahovercolor.html
8.0K -rw-r--r--  1 root 8.0K Dec 13 02:35 b2antispam_genhtaccess.php.txt
8.0K -rw-r--r--  1 root 4.4K Dec 13 02:35 blacklists_prune.php.txt
4.0K -rw-r--r--  1 root   67 Dec 13 02:35 casino-tranny-baccarat.html
4.0K -rw-r--r--  1 root 2.2K Dec 13 04:06 hoverli.html
8.0K -rw-r--r--  1 root 5.4K Dec 13 04:50 clickstealer.html
4.0K -rw-r--r--  1 root 1.6K Dec 13 08:43 smbh.html
4.0K -rw-r--r--  1 root 1.1K Dec 13 14:20 cookieprototype.html
4.0K -rw-r--r--  1 root 1.2K Dec 13 14:20 corners-heavy.png
4.0K -rw-r--r--  1 root 1.3K Dec 13 14:20 dls.html
4.0K -rw-r--r--  1 root 3.6K Dec 13 16:34 multi-selector-test.html
4.0K -rw-r--r--  1 root  402 Dec 13 17:10 edges-heavy.png
 16K -rw-r--r--  1 root  13K Dec 13 17:10 firstline.html
 12K -rw-r--r--  1 root 9.7K Dec 13 17:10 flash.js
4.0K -rw-r--r--  1 root 1.1K Dec 13 17:10 flashdetector.html
4.0K -rw-r--r--  1 root  859 Dec 13 17:10 floattest.html
4.0K -rw-r--r--  1 root  491 Dec 13 17:10 framer.html
4.0K -rw-r--r--  1 root  488 Dec 13 17:10 insetoutset.html
4.0K -rw-r--r--  1 root 3.0K Dec 13 17:10 keepYaLinksPoppin.js
8.0K -rw-r--r--  1 root 5.8K Dec 13 17:10 landscape.html
4.0K -rw-r--r--  1 root  467 Dec 13 17:10 not_tables.html
8.0K -rw-r--r--  1 root 6.1K Dec 13 17:10 objects.html
4.0K -rw-r--r--  1 root 2.7K Dec 13 17:10 sierpinski.html
4.0K -rw-r--r--  1 root 2.6K Dec 13 17:10 standardspoppin.html
 40K -rw-r--r--  1 root  38K Dec 13 17:10 test.htaccess.txt
4.0K -rw-r--r--  1 root    6 Dec 13 17:10 test.txt
4.0K -rw-r--r--  1 root  598 Dec 13 17:10 text-shadow.html
4.0K -rw-r--r--  1 root  713 Dec 13 17:10 window.external.html
4.0K drwxr-xr-x  3 root 4.0K Dec 13 17:40 dtr/
4.0K -rw-r--r--  1 root  500 Dec 13 19:45 not_tables.css
4.0K drwxr-xr-x 28 root 4.0K Dec 13 19:46 ../
4.0K drwxr-xr-x  4 root 4.0K Dec 13 19:48 image_gallery/
4.0K drwxr-xr-x  2 root 4.0K Dec 13 19:48 ical/
4.0K drwxr-xr-x  2 root 4.0K Dec 13 19:48 smbh/
4.0K drwxr-xr-x  2 root 4.0K Dec 13 19:48 manager/
4.0K drwxr-xr-x  2 root 4.0K Dec 13 19:48 life/
4.0K drwxr-xr-x  3 root 4.0K Dec 13 19:48 htaccess/
4.0K drwxr-xr-x  2 root 4.0K Dec 13 19:48 window_focus/
4.0K drwxr-xr-x  2 root 4.0K Dec 13 19:48 passing_nodes_between_frames/
4.0K drwxr-xr-x  3 root 4.0K Dec 13 19:48 Text_Highlighter/
4.0K drwxr-xr-x  3 root 4.0K Dec 13 19:48 Text/
4.0K drwxr-xr-x  3 root 4.0K Dec 13 19:48 highlight/
`ls --help`
Usage: ls [OPTION]... [FILE]...
List information about the FILEs (the current directory by default).
Sort entries alphabetically if none of -cftuvSUX nor --sort is specified.

Mandatory arguments to long options are mandatory for short options too.
  -a, --all                  do not ignore entries starting with .
  -A, --almost-all           do not list implied . and ..
      --author               with -l, print the author of each file
  -b, --escape               print C-style escapes for nongraphic characters
      --block-size=SIZE      scale sizes by SIZE before printing them.  E.g.,
                               '--block-size=M' prints sizes in units of
                               1,048,576 bytes.  See SIZE format below.
  -B, --ignore-backups       do not list implied entries ending with ~
  -c                         with -lt: sort by, and show, ctime (time of last
                               modification of file status information)
                               with -l: show ctime and sort by name
                               otherwise: sort by ctime, newest first
  -C                         list entries by columns
      --color[=WHEN]         colorize the output.  WHEN defaults to 'always'
                               or can be 'never' or 'auto'.  More info below
  -d, --directory            list directory entries instead of contents,
                               and do not dereference symbolic links
  -D, --dired                generate output designed for Emacs' dired mode
  -f                         do not sort, enable -aU, disable -ls --color
  -F, --classify             append indicator (one of */=>@|) to entries
      --file-type            likewise, except do not append '*'
      --format=WORD          across -x, commas -m, horizontal -x, long -l,
                               single-column -1, verbose -l, vertical -C
      --full-time            like -l --time-style=full-iso
  -g                         like -l, but do not list owner
      --group-directories-first
                             group directories before files.
                               augment with a --sort option, but any
                               use of --sort=none (-U) disables grouping
  -G, --no-group             in a long listing, don't print group names
  -h, --human-readable       with -l, print sizes in human readable format
                               (e.g., 1K 234M 2G)
      --si                   likewise, but use powers of 1000 not 1024
  -H, --dereference-command-line
                             follow symbolic links listed on the command line
      --dereference-command-line-symlink-to-dir
                             follow each command line symbolic link
                             that points to a directory
      --hide=PATTERN         do not list implied entries matching shell PATTERN
                               (overridden by -a or -A)
      --indicator-style=WORD  append indicator with style WORD to entry names:
                               none (default), slash (-p),
                               file-type (--file-type), classify (-F)
  -i, --inode                print the index number of each file
  -I, --ignore=PATTERN       do not list implied entries matching shell PATTERN
  -k, --kibibytes            use 1024-byte blocks
  -l                         use a long listing format
  -L, --dereference          when showing file information for a symbolic
                               link, show information for the file the link
                               references rather than for the link itself
  -m                         fill width with a comma separated list of entries
  -n, --numeric-uid-gid      like -l, but list numeric user and group IDs
  -N, --literal              print raw entry names (don't treat e.g. control
                               characters specially)
  -o                         like -l, but do not list group information
  -p, --indicator-style=slash
                             append / indicator to directories
  -q, --hide-control-chars   print ? instead of non graphic characters
      --show-control-chars   show non graphic characters as-is (default
                             unless program is 'ls' and output is a terminal)
  -Q, --quote-name           enclose entry names in double quotes
      --quoting-style=WORD   use quoting style WORD for entry names:
                               literal, locale, shell, shell-always, c, escape
  -r, --reverse              reverse order while sorting
  -R, --recursive            list subdirectories recursively
  -s, --size                 print the allocated size of each file, in blocks
  -S                         sort by file size
      --sort=WORD            sort by WORD instead of name: none -U,
                             extension -X, size -S, time -t, version -v
      --time=WORD            with -l, show time as WORD instead of modification
                             time: atime -u, access -u, use -u, ctime -c,
                             or status -c; use specified time as sort key
                             if --sort=time
      --time-style=STYLE     with -l, show times using style STYLE:
                             full-iso, long-iso, iso, locale, +FORMAT.
                             FORMAT is interpreted like 'date'; if FORMAT is
                             FORMAT1FORMAT2, FORMAT1 applies to
                             non-recent files and FORMAT2 to recent files;
                             if STYLE is prefixed with 'posix-', STYLE
                             takes effect only outside the POSIX locale
  -t                         sort by modification time, newest first
  -T, --tabsize=COLS         assume tab stops at each COLS instead of 8
  -u                         with -lt: sort by, and show, access time
                               with -l: show access time and sort by name
                               otherwise: sort by access time
  -U                         do not sort; list entries in directory order
  -v                         natural sort of (version) numbers within text
  -w, --width=COLS           assume screen width instead of current value
  -x                         list entries by lines instead of by columns
  -X                         sort alphabetically by entry extension
  -Z, --context              print any SELinux security context of each file
  -1                         list one file per line
      --help     display this help and exit
      --version  output version information and exit

SIZE is an integer and optional unit (example: 10M is 10*1024*1024).  Units
are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (powers of 1000).

Using color to distinguish file types is disabled both by default and
with --color=never.  With --color=auto, ls emits color codes only when
standard output is connected to a terminal.  The LS_COLORS environment
variable can change the settings.  Use the dircolors command to set it.

Exit status:
 0  if OK,
 1  if minor problems (e.g., cannot access subdirectory),
 2  if serious trouble (e.g., cannot access command-line argument).

Report ls bugs to bug-coreutils@gnu.org
GNU coreutils home page: 
General help using GNU software: 
Report ls translation bugs to 
For complete documentation, run: info coreutils 'ls invocation'
exec('ls')
wp-contactform.php
exec('ls') (a second time)
wp-contactform.php
`dir`
DOMinnerHTML.html		ical
HEADER.html			image_gallery
README.html			import-b2evolution.php
Text				insetoutset.html
Text_Highlighter		keepYaLinksPoppin.js
ahovercolor.html		landscape.html
anchors.html			life
b2antispam_genhtaccess.php	manager
b2antispam_genhtaccess.php.txt	multi-selector-test.html
b2antispam_htaccess.php		name_to_color.php
blacklists_prune.php.txt	not_tables.css
casino-tranny-baccarat.html	not_tables.html
clickstealer.html		objects.html
cookieprototype.html		objects.php
corners-heavy.png		passing_nodes_between_frames
dls.html			remote_fopen.php
dtr				reserved.php
edges-heavy.png			scriptsniff.php
error_log			sierpinski.html
exec.php			smbh
filename.php			smbh.html
firstline.html			standardspoppin.html
flash.js			syntax.php
flashdetector.html		test.htaccess.txt
floattest.html			test.txt
framer.html			text-shadow.html
fsockopen.php			threecol_123.php
highlight			window.external.html
hoverli.html			window_focus
htaccess			wp-contactform.php
exec('dir')
htaccess			wp-contactform.php
`foo`
exec('foo')