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I have a file something like:
# ID 1 blah blah blah blah $ description 1 blah blah # ID 2 blah $ description 2 blah blah blah blah How can I use a sed command to delete all lines between the # and $ line? So the result will become:
# ID 1 $ description 1 blah blah # ID 2 $ description 2 blah blah blah blah Can you please kindly give an explanation as well?
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To begin with, if you want to delete a line containing the keyword, you would run sed as shown below. Similarly, you could run the sed command with option -n and negated p , (! p) command. To delete lines containing multiple keywords, for example to delete lines with the keyword green or lines with keyword violet.
N command reads the next line in the pattern space. d deletes the entire pattern space which contains the current and the next line. Using the substitution command s, we delete from the newline character till the end, which effective deletes the next line after the line containing the pattern Unix.
You can tell sed to carry out multiple operations by just repeating -e (or -f if your script is in a file). sed -i -e 's/a/b/g' -e 's/b/d/g' file makes both changes in the single file named file , in-place.
Immediately after opening a file, type “gg” to move the cursor to the first line of the file, assuming it is not already there. Then type dG to delete all the lines or text in it.
Use this sed command to achieve that:
sed '/^#/,/^\$/{/^#/!{/^\$/!d}}' file.txt Mac users (to prevent extra characters at the end of d command error) need to add semicolons before the closing brackets
sed '/^#/,/^\$/{/^#/!{/^\$/!d;};}' file.txt # ID 1 $ description 1 blah blah # ID 2 $ description 2 blah blah blah blah /^#/,/^\$/ will match all the text between lines starting with # to lines starting with $. ^ is used for start of line character. $ is a special character so needs to be escaped./^#/! means do following if start of line is not # /^$/! means do following if start of line is not $ d means deleteSo overall it is first matching all the lines from ^# to ^\$ then from those matched lines finding lines that don't match ^# and don't match ^\$ and deleting them using d.
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$ cat test 1 start 2 end 3 $ sed -n '1,/start/p;/end/,$p' test 1 start end 3 $ sed '/start/,/end/d' test 1 3 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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