Shell – Remove last / of path string using sed

sedshell

I'm trying to use sed to replace just the last / in the following directory structure, but I'm not able to succeed with this. Any suggestions?

Input is /tmp/ABC/Dirs/, output should be /tmp/ABC/Dirs

echo " /tmp/ABC/Dirs/"  | sed -r "s/\/(?:[a-zA-Z0-9])/g"

Best Answer

I was the one who answered the question first with my s/\/$// comment.

Other people had time to contribute much fuller answers that day.

SO today -a few days later- I post a redundant answer, because I want the "Peer Pressure" Bronze award gone from the list.

sed -e s./$..g   # You can golf the quotes and the "\" here

So please, good folks, please downvote this time until -3 :)

Using `awk`

If the comma is always at the end of the second to last line:

$ awk 'NR>2{print a;} {a=b; b=$0} END{sub(/,$/, "", a); print a;print b;}'  input
[11911,0,"BUILDER","2014-10-15","BUILDER",0,0],
[11912,0,"BUILDER","2014-10-15","BUILDER",0,0],
[11913,0,"BUILDER","2014-10-15","BUILDER",0,0]
]

Using `awk` and `bash`

$ awk -v "line=$(($(wc -l <input)-1))" 'NR==line{sub(/,$/, "")} 1'  input
[11911,0,"BUILDER","2014-10-15","BUILDER",0,0],
[11912,0,"BUILDER","2014-10-15","BUILDER",0,0],
[11913,0,"BUILDER","2014-10-15","BUILDER",0,0]
]

Using `sed`

$ sed 'x;${s/,$//;p;x;};1d'  input
[11911,0,"BUILDER","2014-10-15","BUILDER",0,0],
[11912,0,"BUILDER","2014-10-15","BUILDER",0,0],
[11913,0,"BUILDER","2014-10-15","BUILDER",0,0]
]

For OSX and other BSD platforms, try:

sed -e x -e '$ {s/,$//;p;x;}' -e 1d  input

Using `bash`

while IFS=  read -r line
do
    [ "$a" ] && printf "%s\n" "$a"
    a=$b
    b=$line
done <input
printf "%s\n" "${a%,}"
printf "%s\n" "$b"

Best Answer

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