Shell Programming and Scripting

# awk -vx="date" 'NR==1{split($0,a,x);print a[1] x RS a[2];next}1' bb

let x is "date" x any variable name that we want

IF, NR (Number of Record) is 1 so its equal our first line 
(awk line definition, any row (line) that is finished the default Record Seperator(\n) that is newline)

split, split($0 -> our line -> "emplid|empl_name|salary|hire_date1111|gro|3000|01/01/2014" )
            (a -> the arrary name i m named the a or b or c or whatelse you want )
            (x -> "date")
so split our line from "date" and placed to the my array that named a[1],a[2]

i split it like the below..

emplid|empl_name|salary|hire_    date    1111|gro|3000|01/01/2014

a[1] -> emplid|empl_name|salary|hire_ 
a[2] -> 1111|gro|3000|01/01/2014

and print my values ( x -> date , RS -> '\n' )

print a[1] x RS a[2]  -> emplid|empl_name|salary|hire_date
                         1111|gro|3000|01/01/2014

next -> stop processing (remember, we have been specified the NR==1 for first record processing) and 
pass (read) the other lines and continue (if there is any action specified then awk process its,our action is 1 (}1 -> equals the print ))

}1 -> print the other lines (if we dont write it awk only print the first record (line) output 
and exit because of we specified the if NR==1 then do action although awk default action is print )