test_cases.txt

======TEST CASE======
$ ch grep -l
       grep, egrep, fgrep, rgrep - print lines matching a pattern

       -l, --files-with-matches
              Suppress normal output; instead print the name of each input file from which output would normally have
              been printed.  The scanning will stop on the first match.
======TEST CASE======
$ ch ls -v
       ls - list directory contents

       -v     natural sort of (version) numbers within text
======TEST CASE======
$ ch column -t
     column — columnate lists

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with
             whitespace, by default, or with the characters supplied using the -s option.  Useful for pretty-printing
             displays.
======TEST CASE======
$ ch cd -P
    cd - Change the shell working directory.

        -P	use the physical directory structure without following symbolic
    	links: resolve symbolic links in DIR before processing instances
    	of `..'
======TEST CASE======
$ ch ls -latrh
       ls - list directory contents

       -l     use a long listing format

       -a, --all
              do not ignore entries starting with .

       -t     sort by modification time, newest first

       -r, --reverse
              reverse order while sorting

       -h, --human-readable
              with -l and/or -s, print human readable sizes (e.g., 1K 234M 2G)

======TEST CASE======
$ ch ls --author
       ls - list directory contents

       --author
              with -l, print the author of each file
======TEST CASE======
$ ch grep --regexp
       grep, egrep, fgrep, rgrep - print lines matching a pattern

       -e PATTERN, --regexp=PATTERN
              Use PATTERN as the pattern.  If this option is used multiple times or is combined with the -f  (--file)
              option,  search  for  all  patterns given.  This option can be used to protect a pattern beginning with
              “-”.
======TEST CASE======
$ ch grep --color=auto
       grep, egrep, fgrep, rgrep - print lines matching a pattern

       --color[=WHEN], --colour[=WHEN]
              Surround the matched (non-empty) strings, matching lines, context lines, file names, line numbers, byte
              offsets, and separators (for fields and groups of context lines) with escape sequences to display  them
              in  color  on  the  terminal.   The  colors  are  defined by the environment variable GREP_COLORS.  The
              deprecated environment variable GREP_COLOR is still supported, but its setting does not have  priority.
              WHEN is never, always, or auto.
======TEST CASE======
$ ch find -mtime
       find - search for files in a directory hierarchy

       -mtime n
              File's  data  was last modified n*24 hours ago.  See the comments for -atime to understand how rounding
              affects the interpretation of file modification times.
======TEST CASE======
$ ch grep -l -ro
       grep, egrep, fgrep, rgrep - print lines matching a pattern

       -l, --files-with-matches
              Suppress normal output; instead print the name of each input file from which output would normally have
              been printed.  The scanning will stop on the first match.
       -r, --recursive
              Read  all  files  under  each  directory, recursively, following symbolic links only if they are on the
              command line.  Note that if no file operand is given, grep searches the  working  directory.   This  is
              equivalent to the -d recurse option.

       -o, --only-matching
              Print  only  the matched (non-empty) parts of a matching line, with each such part on a separate output
              line.

======TEST CASE======
$ ch grep 'exit status'
       grep, egrep, fgrep, rgrep - print lines matching a pattern

              file name wildcard expansion and therefore  should  not  be  treated  as  options.   This  behavior  is
              available only with the GNU C library, and only when POSIXLY_CORRECT is not set.

EXIT STATUS
       Normally  the exit status is 0 if a line is selected, 1 if no lines were selected, and 2 if an error occurred.
       However, if the -q or --quiet or --silent is used and a line is selected, the exit status  is  0  even  if  an
       error occurred.

COPYRIGHT
======TEST CASE======
$ ch sed NUL
       sed - stream editor for filtering and transforming text


       -z, --null-data

              separate lines by NUL characters

       --help
              display this help and exit
======TEST CASE======
$ ch wget -o
       Wget - The non-interactive network downloader.

       -o logfile
       --output-file=logfile
           Log all messages to logfile.  The messages are normally reported to standard error.
======TEST CASE======
$ ch read -n -N
    read - Read a line from the standard input and split it into fields.

      -n nchars	return after reading NCHARS characters rather than waiting
    		for a newline, but honor a delimiter if fewer than NCHARS
    		characters are read before the delimiter
      -N nchars	return only after reading exactly NCHARS characters, unless
    		EOF is encountered or read times out, ignoring any delimiter
======TEST CASE======
$ ch rename -nono
       rename - renames multiple files

       -n, -nono
               No action: print names of files to be renamed, but don't rename.
======TEST CASE======
$ ch xyz
Error: xyz is not a valid command
======TEST CASE======
$ ch rename -verbose -n
       rename - renames multiple files

       -v, -verbose
               Verbose: print names of files successfully renamed.
       -n, -nono
               No action: print names of files to be renamed, but don't rename.
======TEST CASE======
$ ch printf %b
    printf - Formats and prints ARGUMENTS under control of the FORMAT.

      %b	expand backslash escape sequences in the corresponding argument
      %q	quote the argument in a way that can be reused as shell input
      %(fmt)T output the date-time string resulting from using FMT as a format
            string for strftime(3)
======TEST CASE======
$ ch sed -i
       sed - stream editor for filtering and transforming text

       -i[SUFFIX], --in-place[=SUFFIX]

              edit files in place (makes backup if SUFFIX supplied)
======TEST CASE======
$ ch awk -v
       gawk - pattern scanning and processing language

       -v var=val
       --assign var=val
              Assign the value val to the variable var, before execution of the program begins.  Such variable values
              are available to the BEGIN rule of an AWK program.