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swap words in a line with sed

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# 1  
Old 08-29-2006
swap words in a line with sed
Hello. There is something I can not manage : I want to swap the first word with the third one in every line. No file is given the input is read from the keyboard. I know I have to use sed, but it seems this is too complicated for me. Could you help me please ?
Thanks,
atticus
# 2  
Old 08-29-2006
why not awk
Have you checked awk..It should be easy with awk..Check awk manual..
# 3  
Old 08-29-2006
Why sed? try this inside your shell script
echo "Enter your string : \c"
read var1 var2 var3 var4
echo "You entred; $var3 $var2 $var1 $var4"
# 4  
Old 09-05-2006
sed "s/^\(.*\) \(.*\) \(.*\)/\3 \2 \1/" file
# 5  
Old 09-05-2006
Quote:
Originally Posted by anbu23
sed "s/^\(.*\) \(.*\) \(.*\)/\3 \2 \1/" file
this won't work if the input has more than 3 words.
# 6  
Old 09-05-2006
Quote:
Originally Posted by atticus
Hello. There is something I can not manage : I want to swap the first word with the third one in every line. No file is given the input is read from the keyboard. I know I have to use sed, but it seems this is too complicated for me. Could you help me please ?
Thanks,
atticus
if you want it simple, here's a python one

Code:
userinput = raw_input("Enter words: ") #assume eg "word1 word2 word3 word4"
splitted_words = userinput.split()
splitted_words[0], splitted_words[2] = splitted_words[2], splitted_words[0]
print splitted_words

Output:
Code:
bash-2.03$ ./test.py
Enter words: I have a dog
a have I dog

# 7  
Old 09-08-2006
oops i made a mistake. sed "s/^\(.*\) \(.*\) \(.*\)/\3 \2 \1/" file

sed "s/^\([^ ]*\) \([^ ]*\) \([^ ]*\)/\3 \2 \1/"
this will work.
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