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Diffstat (limited to 'examples/scripts/showperm.bash')
| -rw-r--r-- | examples/scripts/showperm.bash | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/examples/scripts/showperm.bash b/examples/scripts/showperm.bash new file mode 100644 index 0000000..2e06c0b --- /dev/null +++ b/examples/scripts/showperm.bash @@ -0,0 +1,53 @@ +#Newsgroups: comp.unix.shell +#From: gwc@root.co.uk (Geoff Clare) +#Subject: Re: Determining permissions on a file +#Message-ID: <Dr79nw.DtL@root.co.uk> +#Date: Fri, 10 May 1996 17:23:56 GMT + +#Here's a bit of Korn shell that converts the symbolic permissions produced +#by "ls -l" into octal, using only shell builtins. How to create a script +#combining this with an "ls -l" is left as an exercise... +# +# +# Converted to Bash v2 syntax by Chet Ramey <chet@po.cwru.edu> +# +# usage: showperm modestring +# +# example: showperm '-rwsr-x--x' +# + +[ -z "$1" ] && { + echo "showperm: usage: showperm modestring" >&2 + exit 2 +} + +tmode="$1" + +typeset -i omode sbits +typeset pmode + +# check for set-uid, etc. bits +sbits=0 +case $tmode in +???[sS]*) (( sbits += 8#4000 )) ;; # set-uid +??????[sSl]*) (( sbits += 8#2000 )) ;; # set-gid or mand. lock +?????????[tT]*) (( sbits += 8#1000 )) ;; # sticky +esac + +omode=0 +while : +do + tmode=${tmode#?} + case $tmode in + "") break ;; + [-STl]*) (( omode *= 2 )) ;; + [rwxst]*) (( omode = omode*2 + 1 )) ;; + *) echo "$0: first letter of \"$tmode\" is unrecognized" >&2 + (( omode *= 2 )) + ;; + esac +done + +(( omode += sbits )) + +printf "0%o\n" $omode |