Switch characters in a string using sed
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How would you switch characters in a string using sed?
Say we had a number 12345678 and I wanted to switch the 2nd and 4th digit with each other (i.e. number = 14325678).
text-processing sed
edited Feb 11 at 3:47
αғsнιη
17k102966
asked Feb 10 at 23:51
JKFJKF
61
add a comment |
How would you switch characters in a string using sed?
Say we had a number 12345678 and I wanted to switch the 2nd and 4th digit with each other (i.e. number = 14325678).
text-processing sed
edited Feb 11 at 3:47
αғsнιη
17k102966
asked Feb 10 at 23:51
JKFJKF
61
sedmodifies lines, not strings. Where on the line is this string that you want to modify? Is the number the only thing on each line?
– Kusalananda
Feb 11 at 6:50
add a comment |
How would you switch characters in a string using sed?
Say we had a number 12345678 and I wanted to switch the 2nd and 4th digit with each other (i.e. number = 14325678).
text-processing sed
edited Feb 11 at 3:47
αғsнιη
17k102966
asked Feb 10 at 23:51
JKFJKF
61
How would you switch characters in a string using sed?
Say we had a number 12345678 and I wanted to switch the 2nd and 4th digit with each other (i.e. number = 14325678).
text-processing sed
text-processing sed
edited Feb 11 at 3:47
αғsнιη
17k102966
asked Feb 10 at 23:51
JKFJKF
61
edited Feb 11 at 3:47
αғsнιη
17k102966
asked Feb 10 at 23:51
JKFJKF
61
edited Feb 11 at 3:47
αғsнιη
17k102966
edited Feb 11 at 3:47
αғsнιη
17k102966
edited Feb 11 at 3:47
αғsнιη
17k102966
17k102966
asked Feb 10 at 23:51
JKFJKF
61
asked Feb 10 at 23:51
JKFJKF
61
asked Feb 10 at 23:51
JKFJKF
61
61
sedmodifies lines, not strings. Where on the line is this string that you want to modify? Is the number the only thing on each line?
– Kusalananda
Feb 11 at 6:50
add a comment |
sedmodifies lines, not strings. Where on the line is this string that you want to modify? Is the number the only thing on each line?
– Kusalananda
Feb 11 at 6:50
sed modifies lines, not strings. Where on the line is this string that you want to modify? Is the number the only thing on each line?– Kusalananda
Feb 11 at 6:50
sed modifies lines, not strings. Where on the line is this string that you want to modify? Is the number the only thing on each line?– Kusalananda
Feb 11 at 6:50
add a comment |
2 Answers
2
active
oldest
votes
Group parts of the expression with parenthesis and later recall these groups in different order with n where n is a group index. For example
$ echo 12345678 | sed -E 's/(.)(.)(.)(.)/1432/'
14325678
answered Feb 11 at 0:02
jimmijjimmij
32.1k874108
add a comment |
You can do it multiple ways :
echo 12345678 |
sed -e '
s/./&n/4
s/./n&/2
s/n(.)(.*)(.)n/321/
'
14325678
perl -lne 'print+(unpack "AAAAA*")[0,3,2,1,4]'
perl -F -lane '@F[1,3] = @F[3,1];print @F'
awk -F "" 't=$2;$2=$4;$4=t1' OFS=
With awk, split on empty string so each character becomes a field, which are then shuffled and by way of Ofs var they get taken to stdout.
With Perl, we unpack the string using an ascii template, then rearrange the order and finally print to stdout. The default Ofs is null.
With sed, first we mark the chars needed to be flipped. Then in the last step we exchange them with the help of markers. This method scales with any two char positions you may want to exchange.
HTH.
answered Feb 11 at 4:57
Rakesh SharmaRakesh Sharma
344114
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Group parts of the expression with parenthesis and later recall these groups in different order with n where n is a group index. For example
$ echo 12345678 | sed -E 's/(.)(.)(.)(.)/1432/'
14325678
answered Feb 11 at 0:02
jimmijjimmij
32.1k874108
add a comment |
Group parts of the expression with parenthesis and later recall these groups in different order with n where n is a group index. For example
$ echo 12345678 | sed -E 's/(.)(.)(.)(.)/1432/'
14325678
answered Feb 11 at 0:02
jimmijjimmij
32.1k874108
add a comment |
Group parts of the expression with parenthesis and later recall these groups in different order with n where n is a group index. For example
$ echo 12345678 | sed -E 's/(.)(.)(.)(.)/1432/'
14325678
answered Feb 11 at 0:02
jimmijjimmij
32.1k874108
Group parts of the expression with parenthesis and later recall these groups in different order with n where n is a group index. For example
$ echo 12345678 | sed -E 's/(.)(.)(.)(.)/1432/'
14325678
answered Feb 11 at 0:02
jimmijjimmij
32.1k874108
answered Feb 11 at 0:02
jimmijjimmij
32.1k874108
answered Feb 11 at 0:02
jimmijjimmij
32.1k874108
answered Feb 11 at 0:02
jimmijjimmij
32.1k874108
32.1k874108
add a comment |
add a comment |
You can do it multiple ways :
echo 12345678 |
sed -e '
s/./&n/4
s/./n&/2
s/n(.)(.*)(.)n/321/
'
14325678
perl -lne 'print+(unpack "AAAAA*")[0,3,2,1,4]'
perl -F -lane '@F[1,3] = @F[3,1];print @F'
awk -F "" 't=$2;$2=$4;$4=t1' OFS=
With awk, split on empty string so each character becomes a field, which are then shuffled and by way of Ofs var they get taken to stdout.
With Perl, we unpack the string using an ascii template, then rearrange the order and finally print to stdout. The default Ofs is null.
With sed, first we mark the chars needed to be flipped. Then in the last step we exchange them with the help of markers. This method scales with any two char positions you may want to exchange.
HTH.
answered Feb 11 at 4:57
Rakesh SharmaRakesh Sharma
344114
add a comment |
You can do it multiple ways :
echo 12345678 |
sed -e '
s/./&n/4
s/./n&/2
s/n(.)(.*)(.)n/321/
'
14325678
perl -lne 'print+(unpack "AAAAA*")[0,3,2,1,4]'
perl -F -lane '@F[1,3] = @F[3,1];print @F'
awk -F "" 't=$2;$2=$4;$4=t1' OFS=
With awk, split on empty string so each character becomes a field, which are then shuffled and by way of Ofs var they get taken to stdout.
With Perl, we unpack the string using an ascii template, then rearrange the order and finally print to stdout. The default Ofs is null.
With sed, first we mark the chars needed to be flipped. Then in the last step we exchange them with the help of markers. This method scales with any two char positions you may want to exchange.
HTH.
answered Feb 11 at 4:57
Rakesh SharmaRakesh Sharma
344114
add a comment |
You can do it multiple ways :
echo 12345678 |
sed -e '
s/./&n/4
s/./n&/2
s/n(.)(.*)(.)n/321/
'
14325678
perl -lne 'print+(unpack "AAAAA*")[0,3,2,1,4]'
perl -F -lane '@F[1,3] = @F[3,1];print @F'
awk -F "" 't=$2;$2=$4;$4=t1' OFS=
With awk, split on empty string so each character becomes a field, which are then shuffled and by way of Ofs var they get taken to stdout.
With Perl, we unpack the string using an ascii template, then rearrange the order and finally print to stdout. The default Ofs is null.
With sed, first we mark the chars needed to be flipped. Then in the last step we exchange them with the help of markers. This method scales with any two char positions you may want to exchange.
HTH.
answered Feb 11 at 4:57
Rakesh SharmaRakesh Sharma
344114
You can do it multiple ways :
echo 12345678 |
sed -e '
s/./&n/4
s/./n&/2
s/n(.)(.*)(.)n/321/
'
14325678
perl -lne 'print+(unpack "AAAAA*")[0,3,2,1,4]'
perl -F -lane '@F[1,3] = @F[3,1];print @F'
awk -F "" 't=$2;$2=$4;$4=t1' OFS=
With awk, split on empty string so each character becomes a field, which are then shuffled and by way of Ofs var they get taken to stdout.
With Perl, we unpack the string using an ascii template, then rearrange the order and finally print to stdout. The default Ofs is null.
With sed, first we mark the chars needed to be flipped. Then in the last step we exchange them with the help of markers. This method scales with any two char positions you may want to exchange.
HTH.
answered Feb 11 at 4:57
Rakesh SharmaRakesh Sharma
344114
edited Feb 11 at 5:07
answered Feb 11 at 4:57
Rakesh SharmaRakesh Sharma
344114
answered Feb 11 at 4:57
Rakesh SharmaRakesh Sharma
344114
answered Feb 11 at 4:57
Rakesh SharmaRakesh Sharma
344114
344114
add a comment |
add a comment |
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sedmodifies lines, not strings. Where on the line is this string that you want to modify? Is the number the only thing on each line?– Kusalananda
Feb 11 at 6:50