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Erez
83 lines
2.4 KiB
Bash
Executable File
83 lines
2.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Contributed by Erez Binyamin (github.com/ErezBinyamin)
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# Translate between chmod string and number
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# Inspired by http://permissions-calculator.org/
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# Contrib to chubin - cheat.sh
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chmod_calc(){
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p_s=""
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p_n=""
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R=()
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W=()
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X=()
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S=()
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setuid=' '
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setgid=' '
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sticky=' '
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# If permission number is given calc string
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if [[ $1 =~ ^-?[0-9]+$ && ${#1} -ge 2 && ${#1} -le 4 ]]
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then
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p_n=$1
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for (( i=0; i<${#1}; i++ ))
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do
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num=$(echo "obase=2;${1:$i:1}" | bc | xargs printf '%03d')
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if [[ ${#1} -eq 4 && $i -eq 0 ]]
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then
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[ ${num:0:1} -eq 1 ] && setuid='X' || setuid=' '
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[ ${num:1:1} -eq 1 ] && setgid='X' || setgid=' '
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[ ${num:2:1} -eq 1 ] && sticky='X' || sticky=' '
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else
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[ ${num:0:1} -eq 1 ] && p_s+='r' || p_s+='-'
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[ ${num:1:1} -eq 1 ] && p_s+='w' || p_s+='-'
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if [[ $sticky == 'X' ]]
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then
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[ ${num:2:1} -eq 1 ] && p_s+='t' || p_s+='T'
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else
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[ ${num:2:1} -eq 1 ] && p_s+='x' || p_s+='-'
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fi
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[ ${num:0:1} -eq 1 ] && R+=('X') || R+=(' ')
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[ ${num:1:1} -eq 1 ] && W+=('X') || W+=(' ')
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[ ${num:2:1} -eq 1 ] && X+=('X') || X+=(' ')
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fi
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done
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# If permission string is given calc number
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elif [[ ${#1} -le 9 && $(( ${#1} % 3 )) -eq 0 && $1 =~ ^[r,t,T,w,x,-]+$ ]]
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then
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p_s=$1
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[[ ${p_s,,} =~ 's' ]] && p_n+="1" || p_n+="0"
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[[ ${p_s,,} =~ 's' ]] && sticky='X'
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for (( i=0; i<${#1}; i+=0 ))
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do
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num=0
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[[ ${1:$i:1} == 'r' ]] && R+=('X') || R+=(' ')
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[[ ${1:$((i++)):1} == 'r' ]] && let num++
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num=$(( num << 1 ))
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[[ ${1:$i:1} == 'w' ]] && W+=('X') || W+=(' ')
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[[ ${1:$((i++)):1} == 'w' ]] && let num++
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num=$(( num << 1 ))
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[[ 'xt' =~ ${1:$i:1} ]] && X+=('X') || X+=(' ')
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[[ 'Tt' =~ ${1:$i:1} ]] && S+=('X') || S+=(' ')
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[[ 'xt' =~ ${1:$((i++)):1} ]] && let num++
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p_n+="$num"
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done
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else
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printf "Invalid permissions string: $1"
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return 1
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fi
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# Print Final results table
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printf "
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Linux Permissions String:\t${p_s}
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Linux Permissions Number:\t${p_n}
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Special\t\tOwner\t\tGroup\t\tPublic
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Setuid [$setuid]\tRead [${R[0]}]\tRead [${R[1]}]\tRead [${R[2]}]
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Setgid [$setgid]\tWrite [${W[0]}]\tWrite [${W[1]}]\tWrite [${W[2]}]
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Sticky bit [$sticky]\tExecute [${X[0]}]\tExecute [${X[1]}]\tExecute [${X[2]}]
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"
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}
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chmod_calc $@
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