For reasonably modern versions of sed, edit the standard input to yield the standard output with $ echo ‘τέχνη βιβλίο γη κήπος’ | sed -E -e ‘s/[[:blank:]]+/\n/g’ τέχνη βιβλίο γη κήπος If your vocabulary words are in files named lesson1 and lesson2, redirect sed’s standard output to the file all-vocab with sed -E -e ‘s/[[:blank:]]+/\n/g’ … Read more
Try this: website=$(sed ‘s”https://stackoverflow.com/”\\/|g’ <<< $website) Bash actually supports this sort of replacement natively: ${parameter/pattern/string} — replace the first match of pattern with string. ${parameter//pattern/string} — replace all matches of pattern with string. Therefore you can do: website=${website////\\/} Explanation: website=${website // / / \\/} ^ ^ ^ ^ | | | | | | | … Read more
grep was born to extract things: grep -Po ‘name=”\K[^”]*’ test with your data: kent$ echo ‘<parameter name=”PortMappingEnabled” access=”readWrite” type=”xsd:boolean”></parameter> <parameter name=”PortMappingLeaseDuration” access=”readWrite” activeNotify=”canDeny” type=”xsd:unsignedInt”></parameter> <parameter name=”RemoteHost” access=”readWrite”></parameter> <parameter name=”ExternalPort” access=”readWrite” type=”xsd:unsignedInt”></parameter> <parameter name=”ExternalPortEndRange” access=”readWrite” type=”xsd:unsignedInt”></parameter> <parameter name=”InternalPort” access=”readWrite” type=”xsd:unsignedInt”></parameter> <parameter name=”PortMappingProtocol” access=”readWrite”></parameter> <parameter name=”InternalClient” access=”readWrite”></parameter> <parameter name=”PortMappingDescription” access=”readWrite”></parameter> ‘|grep -Po ‘name=”\K[^”]*’ PortMappingEnabled PortMappingLeaseDuration RemoteHost ExternalPort … Read more
This might work for you: sed ‘/text\|blah/!d’ file some text here blah blah 123 some other text as well
You need to escape your backslash: p.sub(‘gray \\1′, s) alternatively you can use a raw string as you already did for the regex: p.sub(r’gray \1’, s)
grep -Fxvf file1 file2 What the flags mean: -F, –fixed-strings Interpret PATTERN as a list of fixed strings, separated by newlines, any of which is to be matched. -x, –line-regexp Select only those matches that exactly match the whole line. -v, –invert-match Invert the sense of matching, to select non-matching lines. -f FILE, –file=FILE Obtain … Read more
If you don’t want to print the matched line (or any following lines): sed -n ‘/The second line/q;p’ inputfile This says “when you reach the line that matches the pattern quit, otherwise print each line”. The -n option prevents implicit printing and the p command is required to explicitly print lines. or sed ‘/The second … Read more
If you don’t want to print lines that don’t match, you can use the combination of -n option which tells sed not to print p flag which tells sed to print what is matched This gives: sed -n ‘s/…/…/p’ Additionally, you can use a preceding matching pattern /match only these lines/ to only apply the … Read more
With Perl perl -i -ne’next if /clean_history_in_os=true/ && ++$ok > 1; print’ file This increments the counter when on that line and if > 1 it skips the line, otherwise prints The question came up of how to pass the pattern to Perl if we have it as a shell variable. Below I assume that … Read more
e switch in sed substitute applies sh -c to unmatched text as well as evident from this command: echo ‘a 1449158360’ | sed -r ‘s#([0-9]{10})#date -d@\1 “+%Y”;#e’ sh: a: command not found So even though we are matching only 1449158360 but sh -c is being run on a 1449158360. Due to absence of non-greedy and … Read more