+# * Compatibility with macOS may be limited if any arguments
+# are provided when running `bkdatev`; e.g. passing a
+# `--date` option to `bkdatev` will fail.
+
+yell() { echo "$0: $*" >&2; }
+die() { yell "$*"; exit 111; }
+must() { "$@" || die "cannot $*"; }
+insertStr() {
+ # Desc: Inserts a string into another string at a specified position.
+ # Input: arg1: str str_rec String to receive insertion
+ # arg2: int pos Insertion position (0 = append to front)
+ # arg3: str str_ins String to be inserted
+ # Output: stdout: Combined string
+ # Version: 0.0.2
+ # Depends: BK-2020-03: yell(), die(), must()
+ # Ref/Attrib: * BK-2020-03: https://gitlab.com/baltakatei/baltakatei-exdev/
+ # * Cooper, Mendel. “Advanced Bash-Scripting Guide: Manipulating Strings”. tldp.org https://tldp.org/LDP/abs/html/string-manipulation.html
+
+ local str_rec pos str_ins re len_str_rec;
+ local pfx_pos_start pfx_len pfx;
+ local sfx_pos_start sfx_len sfx;
+
+ # Check args
+ if [[ $# -ne 3 ]]; then
+ yell "ERROR:Invalid argument count:$#";
+ return 1; fi;
+ re='^[0-9]+$';
+ if [[ ! "$2" =~ $re ]]; then
+ yell "ERROR:Not an int:$2";
+ return 1; fi;
+ str_rec="$1";
+ pos="$2";
+ str_ins="$3";
+
+ # Calculate string stats
+ len_str_rec="${#str_rec}";
+
+ # Form prefix
+ pfx_pos_start="0";
+ pfx_len="$pos";
+ pfx="${str_rec:$pfx_pos_start:$pfx_len}";
+
+ # Form suffix
+ sfx_pos_start="$(( pos ))";
+ sfx_len="$(( len_str_rec - pos ))";
+ sfx="${str_rec:$sfx_pos_start:$sfx_len}";
+
+ # Print output to stdout
+ printf "%s%s%s\n" "$pfx" "$str_ins" "$sfx";
+}; # Insert string provided at indicated position via stdout