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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
HOME=/homes/chet
string=abcdefg
set -- a b c
shopt -u patsub_replacement
# verify existing behavior
echo ${string/abc/~}
echo "${string/abc/~}"
echo ${string/abc/"~"}
echo ${string/abc/$notthere}
echo "${string/abc/$notthere}"
echo "${string/abc/"$notthere"}"
echo ${string//?/\$\'&\' }
shopt -s patsub_replacement
echo ${string//?/\$\'&\' }
echo ${string//?/& }
echo "${string//?/& }"
echo ${string//?/\& }
echo "${string//?/\& }"
echo ${string//?/"& "}
echo ${string//?/"\& "}
echo "${string//?/"a "}"
echo "${string//?/"$# "}"
echo ${string/abc/& }
echo "${string/abc/& }"
echo ${string/abc/"& "}
echo ${string/abc/\& }
echo "${string/abc/\& }"
echo ${string/abc/"\& "}
echo ${string/abc/\\& }
rep='\\&'
echo "${string/abc/&}"
echo ${string/abc/\&}
echo "${string/abc/\\&}"
echo ${string/abc/"\\&"}
echo "${string/abc/"\\&"}"
echo ${string/abc/$rep}
echo ${string/abc/"$rep"}
shopt -u patsub_replacement
echo "${string/abc/&}"
echo ${string/abc/\&}
echo "${string/abc/\\&}"
echo "${string/abc/"\\&"}"
echo ${string/abc/"$rep"}
shopt -s patsub_replacement
repl='x&y'
r2='x\&y'
var='letssee'
pat=ss
echo ${var//$pat/"$repl"}
echo "${var//$pat/"$repl"}"
echo ${var//$pat/$repl}
echo "${var//$pat/$repl}"
echo ${var//$pat/"$r2"}
echo "${var//$pat/"$r2"}"
echo ${var//$pat/$r2}
echo "${var//$pat/$r2}"
r2='\\&'
r3='\&'
echo ${var//$pat/\\\&}
echo ${var//$pat/\\$r2}
echo ${var//$pat/\\&}
echo ${var//$pat/$r2}
echo ${var//$pat/"\&"}
echo ${var//$pat/"$r3"}
echo ${var//$pat/"&"}
echo ${var//$pat/$r3}
# these cases provide the same functionality as sed when given a BRE like
# `^' or `$', or when passed a null input line
one=one
null=
echo ${one/#/&two}
echo ${one/#/\&two}
echo ${one/%/&two}
echo ${one/%/\&two}
echo ${null/#/&two}
echo ${null/#/\&two}
echo ${one/#?/&two}
echo ${one/#?/\&two}
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