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You can use grep with -A n option to print N lines after matching lines. Using -B n option you can print N lines before matching lines. Using -C n option you can print N lines before and after matching lines.
For BSD or GNU grep you can use -B num to set how many lines before the match and -A num for the number of lines after the match. If you want the same number of lines before and after you can use -C num . This will show 3 lines before and 3 lines after.
You can use the -B and -A to print lines before and after the match. Will print the 10 lines before the match, including the matching line itself.
To also show you the lines before your matches, you can add -B to your grep. The -B 4 tells grep to also show the 4 lines before the match. Alternatively, to show the log lines that match after the keyword, use the -A parameter. In this example, it will tell grep to also show the 2 lines after the match.
You want:
grep -A 5 '19:55' file
From man grep:
Context Line Control
-A NUM, --after-context=NUM
Print NUM lines of trailing context after matching lines.
Places a line containing a gup separator (described under --group-separator)
between contiguous groups of matches. With the -o or --only-matching
option, this has no effect and a warning is given.
-B NUM, --before-context=NUM
Print NUM lines of leading context before matching lines.
Places a line containing a group separator (described under --group-separator)
between contiguous groups of matches. With the -o or --only-matching
option, this has no effect and a warning is given.
-C NUM, -NUM, --context=NUM
Print NUM lines of output context. Places a line containing a group separator
(described under --group-separator) between contiguous groups of matches.
With the -o or --only-matching option, this has no effect and a warning
is given.
--group-separator=SEP
Use SEP as a group separator. By default SEP is double hyphen (--).
--no-group-separator
Use empty string as a group separator.
Some awk version.
awk '/19:55/{c=5} c-->0'
awk '/19:55/{c=5} c && c--'
When pattern found, set c=5
If c is true, print and decrease number of c
Here is a sed solution:
sed '/19:55/{
N
N
N
N
N
s/\n/ /g
}' file.txt
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