$ 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. $ 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 `..'

$ 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) 

$ ch ls --author ls - list directory contents --author with -l, print the author of each file $ 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. $ 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 “-”.

$ 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.

$ 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.

$ 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.

$ 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.

$ 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 $ 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

$ ch find -type find - search for files in a directory hierarchy -type c File is of type c: $ # ideally, it should be find - search for files in a directory hierarchy -type c File is of type c: b block (buffered) special c character (unbuffered) special d directory p named pipe (FIFO) f regular file l symbolic link; this is never true if the -L option or the -follow option is in effect, unless the symbolic link is broken. If you want to search for symbolic links when -L is in effect, use -xtype. s socket D door (Solaris)

$ # should have extracted only option line $ 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)

$ # depends on width of terminal, this issue seen on 120 as width $ ch sort -V sort - sort lines of text files -V $ # the issue is because another line happened to start with `-V` before the `-V` option definition $ ch sort version-sort sort - sort lines of text files sort according to WORD: general-numeric -g, human-numeric -h, month -M, numeric -n, random -R, version -V -V, --version-sort natural sort of (version) numbers within text Other options:

$ ch() { whatis $1; man $1 | sed -n "/^\s*$2/,/^$/p" ; } $ ch grep -l grep (1) - 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. $ ch ls -v ls (1) - list directory contents -v natural sort of (version) numbers within text