Substring: Difference between revisions
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=={{header|Ksh}}==
<lang ksh>
#!/bin/ksh
# Display a substring:
# - starting from n characters in and of m length;
# - starting from n characters in, up to the end of the string;
# - whole string minus the last character;
# - starting from a known character within the string and of m length;
# - starting from a known substring within the string and of m length.
# # Variables:
#
str='solve this task according to the task description,'
integer n=6 m=14
ch='v'
substr='acc'
# # Functions:
#
# # Function _length(str, start, length) - return substr from start,
# # length chars long (length=-1 = end-of-str)
#
function _length {
typeset _str ; _str="$1"
typeset _st ; integer _st=$2
typeset _ln ; integer _ln=$3
(( _ln == -1 )) && echo "${_str:${_st}}"
echo "${_str:${_st}:${_ln}}"
}
######
# main #
######
print -- "--String (Length: ${#str} chars):"
print "${str}\n"
print -- "--From char ${n} and ${m} chars in length:"
_length "${str}" ${n} ${m}
echo
print -- "--From char ${n} to the end:"
_length "${str}" ${n} -1
print -- "--Last character removed:" # Strings in ksh are zero based
_length "${str}" 0 $(( ${#str}-1 ))
echo
print -- "-From char:'${ch}' and ${m} chars in length:"
foo=${str%${ch}*}
_length "${str}" ${#foo} ${m}
echo
print -- "-From substr:'${substr}' and ${m} chars in length:"
foo=${str%${substr}*}
_length "${str}" ${#foo} ${m}
echo
</lang>
{{out}}<pre>
--String (Length: 50 chars):
solve this task according to the task description,
--From char 6 and 14 chars in length:
this task acco
--From char 6 to the end:
this task according to the task description,
--Last character removed:
solve this task according to the task description
-From char:'v' and 14 chars in length:
ve this task a
-From substr:'acc' and 14 chars in length:
according to t
</pre>
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