Bash equivalent of sed command
I'm writing a script in bash and i would like to know if there is an alternative way to write these sed commands (without using sed):
sed '1,11d;$d' "${SOTTOCARTELLA}"/file
sed '1,11!d' "${SOTTOCARTELLA}"/file
sed '1,11d' -i "${SOTTOCARTELLA}"/file1
bash
asked Nov 24 '18 at 11:20
Paolo AmatoPaolo Amato
11
add a comment |
I'm writing a script in bash and i would like to know if there is an alternative way to write these sed commands (without using sed):
sed '1,11d;$d' "${SOTTOCARTELLA}"/file
sed '1,11!d' "${SOTTOCARTELLA}"/file
sed '1,11d' -i "${SOTTOCARTELLA}"/file1
bash
asked Nov 24 '18 at 11:20
Paolo AmatoPaolo Amato
11
1
Welcome to SO. Stack Overflow is a question and answer page for professional and enthusiastic programmers. Add your own code to your question. You are expected to show at least the amount of research you have put into solving this question yourself.
– Cyrus
Nov 24 '18 at 11:25
1
What are you trying to achieve thatsedisn't doing for you? If I read those commands correctly you can easily achieve the same withheadandtail, but I don't know why you wouldn't use a working solution.
– l0b0
Nov 24 '18 at 11:25
I know that this works, i am just curios about if there is an equivalent that can produce the same result as these sed commands i posted here. How could it be done with head and tail? thanks!
– Paolo Amato
Nov 24 '18 at 11:30
1
If you are usingheadandtail, that's notbash!
– Stephen C
Nov 24 '18 at 11:31
add a comment |
I'm writing a script in bash and i would like to know if there is an alternative way to write these sed commands (without using sed):
sed '1,11d;$d' "${SOTTOCARTELLA}"/file
sed '1,11!d' "${SOTTOCARTELLA}"/file
sed '1,11d' -i "${SOTTOCARTELLA}"/file1
bash
asked Nov 24 '18 at 11:20
Paolo AmatoPaolo Amato
11
I'm writing a script in bash and i would like to know if there is an alternative way to write these sed commands (without using sed):
sed '1,11d;$d' "${SOTTOCARTELLA}"/file
sed '1,11!d' "${SOTTOCARTELLA}"/file
sed '1,11d' -i "${SOTTOCARTELLA}"/file1
bash
bash
asked Nov 24 '18 at 11:20
Paolo AmatoPaolo Amato
11
asked Nov 24 '18 at 11:20
Paolo AmatoPaolo Amato
11
asked Nov 24 '18 at 11:20
Paolo AmatoPaolo Amato
11
asked Nov 24 '18 at 11:20
Paolo AmatoPaolo Amato
11
asked Nov 24 '18 at 11:20
Paolo AmatoPaolo Amato
11
11
1
Welcome to SO. Stack Overflow is a question and answer page for professional and enthusiastic programmers. Add your own code to your question. You are expected to show at least the amount of research you have put into solving this question yourself.
– Cyrus
Nov 24 '18 at 11:25
1
What are you trying to achieve thatsedisn't doing for you? If I read those commands correctly you can easily achieve the same withheadandtail, but I don't know why you wouldn't use a working solution.
– l0b0
Nov 24 '18 at 11:25
I know that this works, i am just curios about if there is an equivalent that can produce the same result as these sed commands i posted here. How could it be done with head and tail? thanks!
– Paolo Amato
Nov 24 '18 at 11:30
1
If you are usingheadandtail, that's notbash!
– Stephen C
Nov 24 '18 at 11:31
add a comment |
1
Welcome to SO. Stack Overflow is a question and answer page for professional and enthusiastic programmers. Add your own code to your question. You are expected to show at least the amount of research you have put into solving this question yourself.
– Cyrus
Nov 24 '18 at 11:25
1
What are you trying to achieve thatsedisn't doing for you? If I read those commands correctly you can easily achieve the same withheadandtail, but I don't know why you wouldn't use a working solution.
– l0b0
Nov 24 '18 at 11:25
I know that this works, i am just curios about if there is an equivalent that can produce the same result as these sed commands i posted here. How could it be done with head and tail? thanks!
– Paolo Amato
Nov 24 '18 at 11:30
1
If you are usingheadandtail, that's notbash!
– Stephen C
Nov 24 '18 at 11:31
1
1
Welcome to SO. Stack Overflow is a question and answer page for professional and enthusiastic programmers. Add your own code to your question. You are expected to show at least the amount of research you have put into solving this question yourself.
– Cyrus
Nov 24 '18 at 11:25
Welcome to SO. Stack Overflow is a question and answer page for professional and enthusiastic programmers. Add your own code to your question. You are expected to show at least the amount of research you have put into solving this question yourself.
– Cyrus
Nov 24 '18 at 11:25
1
1
What are you trying to achieve that
sed isn't doing for you? If I read those commands correctly you can easily achieve the same with head and tail, but I don't know why you wouldn't use a working solution.– l0b0
Nov 24 '18 at 11:25
What are you trying to achieve that
sed isn't doing for you? If I read those commands correctly you can easily achieve the same with head and tail, but I don't know why you wouldn't use a working solution.– l0b0
Nov 24 '18 at 11:25
I know that this works, i am just curios about if there is an equivalent that can produce the same result as these sed commands i posted here. How could it be done with head and tail? thanks!
– Paolo Amato
Nov 24 '18 at 11:30
I know that this works, i am just curios about if there is an equivalent that can produce the same result as these sed commands i posted here. How could it be done with head and tail? thanks!
– Paolo Amato
Nov 24 '18 at 11:30
1
1
If you are using
head and tail, that's not bash!– Stephen C
Nov 24 '18 at 11:31
If you are using
head and tail, that's not bash!– Stephen C
Nov 24 '18 at 11:31
add a comment |
1 Answer
1
active
oldest
votes
With sed '1,11!d' "${SOTTOCARTELLA}"/file you are asking for the first 11 lines of the file;
With sed '1,11d' -i "${SOTTOCARTELLA}"/file1 you are asking for the entire file except for the first 11 lines.
If you don't want to use head, tail or other binaries as suggested, you can achieve the same options using read and some support variables.
For example, let's try sed '1,11!d' "${SOTTOCARTELLA}"/file.
You will need a start point and an end point (and of course, the file).
start=1
end=11
counter="$((start - 1))";
file="${SOTTOCARTELLA}/file"
exec 3<"${file}" ### Create file descriptor 3
while IFS= read -r line <&3; do ### Read file line by line
if [ "${counter}" -lt "${end}" ]; then ### If I'm in my "bundaries"
printf "%sn" "${line}" ### Print the line
fi
counter="$((counter + 1))"
done
exec 3>&- ### Close file descriptor 3
Note that this piece of code can be way better (E.G. adding a control on the counter in while condition), but this is the least you will need to understand two things:
sed,head,tails,awk, etc. are born in order to avoid to rewrite over and over again same routines and, also, for performance issues; this is why everyone, including me, will be telling you to use those.- This kind of codes are useful only for portability concerns, that's why I wrote this piece of code in a posix compliant way.
answered Nov 24 '18 at 11:58
ingroxdingroxd
5981624
add a comment |
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With sed '1,11!d' "${SOTTOCARTELLA}"/file you are asking for the first 11 lines of the file;
With sed '1,11d' -i "${SOTTOCARTELLA}"/file1 you are asking for the entire file except for the first 11 lines.
If you don't want to use head, tail or other binaries as suggested, you can achieve the same options using read and some support variables.
For example, let's try sed '1,11!d' "${SOTTOCARTELLA}"/file.
You will need a start point and an end point (and of course, the file).
start=1
end=11
counter="$((start - 1))";
file="${SOTTOCARTELLA}/file"
exec 3<"${file}" ### Create file descriptor 3
while IFS= read -r line <&3; do ### Read file line by line
if [ "${counter}" -lt "${end}" ]; then ### If I'm in my "bundaries"
printf "%sn" "${line}" ### Print the line
fi
counter="$((counter + 1))"
done
exec 3>&- ### Close file descriptor 3
Note that this piece of code can be way better (E.G. adding a control on the counter in while condition), but this is the least you will need to understand two things:
sed,head,tails,awk, etc. are born in order to avoid to rewrite over and over again same routines and, also, for performance issues; this is why everyone, including me, will be telling you to use those.- This kind of codes are useful only for portability concerns, that's why I wrote this piece of code in a posix compliant way.
answered Nov 24 '18 at 11:58
ingroxdingroxd
5981624
add a comment |
With sed '1,11!d' "${SOTTOCARTELLA}"/file you are asking for the first 11 lines of the file;
With sed '1,11d' -i "${SOTTOCARTELLA}"/file1 you are asking for the entire file except for the first 11 lines.
If you don't want to use head, tail or other binaries as suggested, you can achieve the same options using read and some support variables.
For example, let's try sed '1,11!d' "${SOTTOCARTELLA}"/file.
You will need a start point and an end point (and of course, the file).
start=1
end=11
counter="$((start - 1))";
file="${SOTTOCARTELLA}/file"
exec 3<"${file}" ### Create file descriptor 3
while IFS= read -r line <&3; do ### Read file line by line
if [ "${counter}" -lt "${end}" ]; then ### If I'm in my "bundaries"
printf "%sn" "${line}" ### Print the line
fi
counter="$((counter + 1))"
done
exec 3>&- ### Close file descriptor 3
Note that this piece of code can be way better (E.G. adding a control on the counter in while condition), but this is the least you will need to understand two things:
sed,head,tails,awk, etc. are born in order to avoid to rewrite over and over again same routines and, also, for performance issues; this is why everyone, including me, will be telling you to use those.- This kind of codes are useful only for portability concerns, that's why I wrote this piece of code in a posix compliant way.
answered Nov 24 '18 at 11:58
ingroxdingroxd
5981624
add a comment |
With sed '1,11!d' "${SOTTOCARTELLA}"/file you are asking for the first 11 lines of the file;
With sed '1,11d' -i "${SOTTOCARTELLA}"/file1 you are asking for the entire file except for the first 11 lines.
If you don't want to use head, tail or other binaries as suggested, you can achieve the same options using read and some support variables.
For example, let's try sed '1,11!d' "${SOTTOCARTELLA}"/file.
You will need a start point and an end point (and of course, the file).
start=1
end=11
counter="$((start - 1))";
file="${SOTTOCARTELLA}/file"
exec 3<"${file}" ### Create file descriptor 3
while IFS= read -r line <&3; do ### Read file line by line
if [ "${counter}" -lt "${end}" ]; then ### If I'm in my "bundaries"
printf "%sn" "${line}" ### Print the line
fi
counter="$((counter + 1))"
done
exec 3>&- ### Close file descriptor 3
Note that this piece of code can be way better (E.G. adding a control on the counter in while condition), but this is the least you will need to understand two things:
sed,head,tails,awk, etc. are born in order to avoid to rewrite over and over again same routines and, also, for performance issues; this is why everyone, including me, will be telling you to use those.- This kind of codes are useful only for portability concerns, that's why I wrote this piece of code in a posix compliant way.
answered Nov 24 '18 at 11:58
ingroxdingroxd
5981624
With sed '1,11!d' "${SOTTOCARTELLA}"/file you are asking for the first 11 lines of the file;
With sed '1,11d' -i "${SOTTOCARTELLA}"/file1 you are asking for the entire file except for the first 11 lines.
If you don't want to use head, tail or other binaries as suggested, you can achieve the same options using read and some support variables.
For example, let's try sed '1,11!d' "${SOTTOCARTELLA}"/file.
You will need a start point and an end point (and of course, the file).
start=1
end=11
counter="$((start - 1))";
file="${SOTTOCARTELLA}/file"
exec 3<"${file}" ### Create file descriptor 3
while IFS= read -r line <&3; do ### Read file line by line
if [ "${counter}" -lt "${end}" ]; then ### If I'm in my "bundaries"
printf "%sn" "${line}" ### Print the line
fi
counter="$((counter + 1))"
done
exec 3>&- ### Close file descriptor 3
Note that this piece of code can be way better (E.G. adding a control on the counter in while condition), but this is the least you will need to understand two things:
sed,head,tails,awk, etc. are born in order to avoid to rewrite over and over again same routines and, also, for performance issues; this is why everyone, including me, will be telling you to use those.- This kind of codes are useful only for portability concerns, that's why I wrote this piece of code in a posix compliant way.
answered Nov 24 '18 at 11:58
ingroxdingroxd
5981624
edited Nov 24 '18 at 12:06
answered Nov 24 '18 at 11:58
ingroxdingroxd
5981624
answered Nov 24 '18 at 11:58
ingroxdingroxd
5981624
answered Nov 24 '18 at 11:58
ingroxdingroxd
5981624
5981624
add a comment |
add a comment |
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Welcome to SO. Stack Overflow is a question and answer page for professional and enthusiastic programmers. Add your own code to your question. You are expected to show at least the amount of research you have put into solving this question yourself.
– Cyrus
Nov 24 '18 at 11:25
1
What are you trying to achieve that
sedisn't doing for you? If I read those commands correctly you can easily achieve the same withheadandtail, but I don't know why you wouldn't use a working solution.– l0b0
Nov 24 '18 at 11:25
I know that this works, i am just curios about if there is an equivalent that can produce the same result as these sed commands i posted here. How could it be done with head and tail? thanks!
– Paolo Amato
Nov 24 '18 at 11:30
1
If you are using
headandtail, that's notbash!– Stephen C
Nov 24 '18 at 11:31