Very Computer

by **zol** » Fri, 25 Jan 2002 01:13:30

Hi there
Someone can tell me how to get the length n of a string variable
and to extract for example the first to m-th (<n) characters substring?

Thanx
Olivier

by **Ben Altma** » Fri, 25 Jan 2002 02:44:44

Quote:> Hi there
> Someone can tell me how to get the length n of a string variable
> and to extract for example the first to m-th (<n) characters substring?

Sounds like homework, but you can use ${#variable} to get a length and to
extract a char there are many ways. E.g. sed. you could use pure ksh, by
using typeset defining some vars with restricted lengths to the left and
right. Look at the man page of ksh under typeset for more details.

regards,
Ben

by **Al Shark** » Fri, 25 Jan 2002 04:12:47

> Someone can tell me how to get the length n of a string variable
> and to extract for example the first to m-th (<n) characters
> substring?

Length:
print ${#string}

Substring examples for the first five characters:

(destructively)
typeset -L5 string
print $string

Non-destructively:
typeset -L5 string2=$string
print $string2

or without using a second variable
print ${string%${string#?????}}

by **richy** » Fri, 25 Jan 2002 11:52:22

> Hi there
> Someone can tell me how to get the length n of a string variable
> and to extract for example the first to m-th (<n) characters substring?

> Thanx
> Olivier

try if any of these works:

for the length:
expr length "string"
expr ${variable} : ".*"

for the substr:
expr substr "string" 1 m
echo "string" | cut -c1-m

Very Computer

Kshell: length of a string and substring

Kshell: length of a string and substring

Kshell: length of a string and substring

Kshell: length of a string and substring

Kshell: length of a string and substring