echo(1) I am user bandit23 | md5sum(1) | cut(1) -d ' ' -f 1

 echo(1) I am user bandit23 |  md5sum(1) |  cut(1) -d ' ' -f 1

echo(1) :- display a line of text

Echo the STRING(s) to standard output.
-n	do not output the trailing newline
-e	enable interpretation of backslash escapes
-E	disable interpretation of backslash escapes (default)
--help	display this help and exit
--version	output version information and exit

I am user bandit23 :- Echo the STRING(s) to standard output.

| | :- Pipelines

    

A  pipeline is a sequence of one or more commands separated by one of the control operators | or |&.  The

    format for a pipeline is:

           [time [-p]] [ ! ] command [ [|⎪|&] command2 ... ]

    The standard output of command is connected  via  a  pipe  to  the  standard  input  of  command2.   This

    connection  is performed before any redirections specified by the command (see REDIRECTION below).  If |&

    is used, the standard error of command is connected to command2's standard input through the pipe; it  is

    shorthand  for  2>&1  |.   This  implicit  redirection  of  the  standard  error  is  performed after any

    redirections specified by the command.

    The return status of a pipeline is the exit status of the last command, unless  the  pipefail  option  is

    enabled.   If  pipefail  is  enabled,  the  pipeline's return status is the value of the last (rightmost)

    command to exit with a non-zero status, or zero if all commands exit successfully.  If the reserved  word

    !   precedes  a  pipeline, the exit status of that pipeline is the logical negation of the exit status as

    described above.  The shell waits for all commands in the pipeline to terminate before returning a value.

    If the time reserved word precedes a pipeline, the elapsed as well as user and system  time  consumed  by

    its execution are reported when the pipeline terminates.  The -p option changes the output format to that

    specified by POSIX.  When the shell is in posix mode, it does not recognize time as a  reserved  word  if

    the  next  token begins with a `-'.  The TIMEFORMAT variable may be set to a format string that specifies

    how the timing information should be displayed; see the description of TIMEFORMAT under  Shell  Variables

    below.

    When the shell is in posix mode, time may be followed by a newline.  In this case, the shell displays the

    total user and system time consumed by the shell and its children.  The TIMEFORMAT variable may  be  used

    to specify the format of the time information.

    Each command in a pipeline is executed as a separate process (i.e., in a subshell).

 

md5sum(1) :- 

md5sum(1)	compute and check MD5 message digest
-b, --binary	read in binary mode
-c, --check	read MD5 sums from the FILEs and check them
-t, --text	read in text mode (default)
--quiet	don't print OK for each successfully verified file
--status	don't output anything, status code shows success
-w, --warn	warn about improperly formatted checksum lines
--strict	exit non-zero for any invalid input
--help	display this help and exit
--version	output version information and exit

cut(1) :-

cut (1)	remove sections from each line of files
-b, --bytes=LIST	select only these bytes
-c, --characters=LIST	select only these characters
-d, --delimiter=DELIM	use DELIM instead of TAB for field delimiter
-f, --fields=LIST	select only these fields; also print any line that contains no delimiter character, unless the -s option is specified
--complement	complement the set of selected bytes, characters or fields
-s, --only-delimited	do not print lines not containing delimiters
--output-delimiter=STRING	use STRING as the output delimiter the default is to use the input delimiter
--help	display this help and exit
--version	output version information and exit
-M	from first to M'th (included) byte, character or field
	With no FILE, or when FILE is -, read standard input.

-d ' ' :-

-d '   '
-d, --delimiter=DELIM	use DELIM instead of TAB for field delimiter

-f 1 :-

-f  1
-f, --fields=LIST	select only these fields; also print any line that contains no delimiter character, unless the -s option is specified