cut:
syntax cut option[files]
it is useful if you want to access the vertical slice of a file,by fault,the slices are delimilit by a tab
parameter used options -b list print bytes in list options -c list print characters in list columns -d delim set field for-f -f list print list fields
example cut -d: f1 /etc/passwd; cut -c 1 /etc/passwd
join
syntax join [options] file1 file2 print a line for each pair of input lines,one each from file1 and file2.
parameter -j1 field ;join on field of file1 -j2 field ;join on field of file2 -j field ;join on field of both file1 and file2
example:
suppose file1 contains the following:
1 one
2 two
3 three and file2 contains
1 11
2 22
3 33
issuing the command:join -j 1 file1 file2
yield the following output:
1 one 11
2 two 22
3 three 33
od:
syntax od [options] files
dump files in octal and otehr formats.this program pring a listing of a file's contents in a veriety of formats. each pring consist of an octal byte offset from the start of the file followed by a series of token indicate the contents of the files. frequence used option -t type a named character c ASCII character or "blackslash escape"(\n) o octal(the default) x hexadecimal illustrate od -t o1 file1(the parameter 1 indicate the 1 byte)
