readded udpated scripts directory

scripts/strings.sh

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+# There are many string methods in BASH.  The following exemplify just a handful of them.
+
+# Replace pattern in string.
+
+a='I am a string'
+echo "${a/a/A}"
+# prints
+# I Am a string
+
+# Replace all matches of a pattern in a string.
+
+echo "${a//a/A}"
+# prints
+# I Am A string
+
+# Match the first character at the beginning.
+
+echo "${a/#I/y}"
+# prints
+# y am a string
+
+# Match a achater only at the end.
+
+echo "${a/%g/N}"
+I am a strinN
+
+# Replace a pattern with nothing:
+
+echo "${a/g/}"
+#prints
+# I am a strin
+
+# Add a prefix to array items:
+
+A=(hello world)
+echo "${A[@]/#/R}"
+# prints
+# Rhello Rworld
+
+# Section 15.4: Substrings and subarrays
+
+var='0123456789abcdef'
+
+# Define a zero-based offset
+# Returns from after the third index:
+printf '%s\n' "${var:3}"
+# prints
+# 3456789abcdef
+
+# Offset and length of substring
+printf '%s\n' "${var:3:4}"
+
+# Negative length counts from the end of the string
+printf '%s\n' "${var:3:-5}"
+# prints
+# 3456789a
+
+# Also just prints from the end of the string if no second parameter is provided.
+printf '%s\n' "$var: -6"
+# prints
+# abcdef
+
+# you can also do the same with parentheses to be more concise:
+printf '%s\n' "${var:(-6)}"