added chmod.sh

share/adapters/chmod.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+
+# Contributed by Erez Binyamin (github.com/ErezBinyamin)
+
+# Translate between chmod string and number
+# Contrib to chubin - cheat.sh
+chmod_calc(){
+  p_s=""
+  p_n=""
+  R=()
+  W=()
+  X=()
+  # If permission number is given calc string
+  if [[ $1 =~ ^-?[0-9]+$ ]]
+  then
+    p_n=$1
+    for (( i=0; i<${#1}; i++ ))
+    do
+      num=$(echo "obase=2;${1:$i:1}" | bc | xargs printf '%03d')
+      [ ${num:0:1} -eq 1 ] && p_s+='r' || p_s+='-'
+      [ ${num:1:1} -eq 1 ] && p_s+='w' || p_s+='-'
+      [ ${num:2:1} -eq 1 ] && p_s+='x' || p_s+='-'
+      [ ${num:0:1} -eq 1 ] && R+=('X') || R+=(' ')
+      [ ${num:1:1} -eq 1 ] && W+=('X') || W+=(' ')
+      [ ${num:2:1} -eq 1 ] && X+=('X') || X+=(' ')
+    done
+  # If permission string is given calc number
+  else
+    p_s=$1
+    for (( i=0; i<${#1}; i+=0 ))
+    do
+      num=0
+      [[ ${1:$i:1} == 'r' ]] && R+=('X') || R+=(' ')
+      [[ ${1:$((i++)):1} == 'r' ]] && let num++
+      num=$(( num << 1 ))
+      [[ ${1:$i:1} == 'w' ]] && W+=('X') || W+=(' ')
+      [[ ${1:$((i++)):1} == 'w' ]] && let num++
+      num=$(( num << 1 ))
+      [[ ${1:$i:1} == 'x' ]] && X+=('X') || X+=(' ')
+      [[ ${1:$((i++)):1} == 'x' ]] && let num++
+      p_n+="$num"
+    done
+  fi
+  printf "
+Linux Permissions String:\t${p_s}
+Linux Permissions Number:\t${p_n}
+
+Owner\t\tGroup\t\tPublic
+
+Read    [${R[0]}]\tRead    [${R[1]}]\tRead    [${R[2]}]
+Write   [${W[0]}]\tWrite   [${W[1]}]\tWrite   [${W[2]}]
+Execute [${X[0]}]\tExecute [${X[1]}]\tExecute [${X[2]}]
+"
+}
+
+chmod_calc $@