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cut first 4 characters from a line

 
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# 1  
Old 07-22-2008
cut first 4 characters from a line
Please let me know how to cut first four characters from a line in UNIX after grepping the file..
# 2  
Old 07-22-2008
One way is to pipe the output of grep to cut.

Code:
grep <some expression> <some file> | cut -b5-

# 3  
Old 07-22-2008
i have a variable
$a = "abcd"
i do not know the length of the string..
therefore i do not know the n value of the nth character..
how do i cut the last 4 characters in such a case?
# 4  
Old 07-22-2008
To see how to determine the length, look here: https://www.unix.com/shell-programmin...-variable.html
# 5  
Old 07-22-2008
If you are using ksh
Code:
$ a="abcdefgh"
$ print ${a: -4}
efgh
$ print ${a%????}
abcd
$

# 6  
Old 07-22-2008
Otherwise:

Code:
"${var#${var%????}}"

 
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