59 lines
1.3 KiB
Bash
59 lines
1.3 KiB
Bash
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#!/bin/ksh
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# Display a substring:
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# - starting from n characters in and of m length;
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# - starting from n characters in, up to the end of the string;
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# - whole string minus the last character;
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# - starting from a known character within the string and of m length;
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# - starting from a known substring within the string and of m length.
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# # Variables:
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#
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str='solve this task according to the task description,'
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integer n=6 m=14
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ch='v'
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substr='acc'
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# # Functions:
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#
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# # Function _length(str, start, length) - return substr from start,
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# # length chars long (length=-1 = end-of-str)
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#
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function _length {
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typeset _str ; _str="$1"
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typeset _st ; integer _st=$2
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typeset _ln ; integer _ln=$3
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(( _ln == -1 )) && echo "${_str:${_st}}"
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echo "${_str:${_st}:${_ln}}"
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}
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######
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# main #
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######
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print -- "--String (Length: ${#str} chars):"
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print "${str}\n"
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print -- "--From char ${n} and ${m} chars in length:"
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_length "${str}" ${n} ${m}
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echo
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print -- "--From char ${n} to the end:"
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_length "${str}" ${n} -1
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print -- "--Last character removed:" # Strings in ksh are zero based
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_length "${str}" 0 $(( ${#str}-1 ))
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echo
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print -- "-From char:'${ch}' and ${m} chars in length:"
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foo=${str%${ch}*}
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_length "${str}" ${#foo} ${m}
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echo
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print -- "-From substr:'${substr}' and ${m} chars in length:"
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foo=${str%${substr}*}
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_length "${str}" ${#foo} ${m}
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echo
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