Initial data commit

Task/Substring/Ksh/substring.ksh

@@ -0,0 +1,58 @@
+#!/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