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How to print a line following a pattern in SED?
In sed, that could be accomplished like so: Alternatively, grep’s A option might be what you’re looking for. -A NUM, Print NUM lines of trailing context after matching lines. Hope that helps.
Which is the default action of AWK in Bash?
1 as a true condition, triggers the default action of awk: print the current line ( print $0 ). This will happen always, so it will either print the original line or the modified one. Using s command (substitute) you can search for a line which satisfies a regular expression.
Which is better for multiline processing awk or SED?
I assume awk would be better to do multiline processing, but I am not sure how to do it. Never use the word “pattern” as is it highly ambiguous. Always use “string” or “regexp” (or in shell “globbing pattern”), whichever it is you really mean.
How to add to the end of lines containing a pattern?
/patt/ {…} if the line matches the pattern given by patt, then perform the actions described within {}. In this case: /^all:/ {$0=$0″ anotherthing”} if the line starts (represented by ^) with all:, then append anotherthing to the line. 1 as a true condition, triggers the default action of awk: print the current line ( print $0 ).
How to print all lines after a pattern?
I needed to print ALL lines after the pattern ( ok Ed, REGEX ), so I settled on this one: If pattern match, copy next line into the pattern buffer, delete a return, then quit — side effect is to print. Actually sed -n ‘/pattern/ {n;p}’ filename will fail if the pattern match continuous lines:
How to print only lines from a file?
An input stream. A file (regular text file). Input from a pipeline (command1 | sed -e ‘expr1’ | command2). Use the following syntax: In this example print or show any matching lines from /etc/passwd file: The -n option asks sed to not display the regex or patten unless explicitly asked to do so.
Which is the second line of a sed command?
In this example print second line: The ‘p’ command is preceded by a ‘2’. The number ‘2’ refers to line number two. You can tell sed to perform prints only on a particular line or lines. In this example print 1 to 5 lines: