This is a VI editor command specific to UNIX operating system. It is usually used to substitute texts in VI editor. The basic formula is described below.

parameter1,parameter2s/parameter3 (text to be altered or location involved)/parameter4(final text to be put)

parameter1: Indicates the first line from which the substitution will take place.

0/1 indicates the first line of any file in VI editor. 2 indicate the second line and so on.

Parameter2: Indicates the last line up to which the substitutions will occur. (the count of the final line)

S: Stands for the substitution.

Parameter3: Indicates the part of the text in each line to be substituted or the place of substitution (usually prior to the beginning (^) or after end ($) of the line).

Parameter4: This indicates the final text that the user wishes to put in desired places.