CODEWITHSUNDEEP
bashawksed
theuniverseisflat
theuniverseisflat

Reputation: 881

How can I add a newline after match is found

I want to add a newline after number 64, using awk or sed, in ping output such as this:

64 bytes from 170.198.42.128: icmp_seq=1 ttl=60 time=83.4 ms 64 bytes from
170.198.42.128: icmp_seq=2 ttl=60 time=76.6 ms 64 bytes from 170.198.42.128: icmp_seq=3  
ttl=60 time=70.8 ms 64 bytes from 170.198.42.128: icmp_seq=4 ttl=60 time=76.6 ms --- 
170.198.42.128 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 
3000ms rtt min/avg/max/mdev = 70.861/76.924/83.493/4.473 ms

I've tried

cat file | sed 's/64/\n/g'

but this replaces the number 64. I want to break the pattern and display the ping command pattern starting with 64 properly.

I tried using append and insert mode ..but not using them correctly

Upvotes: 7

Views: 23054

Answers (4)

Alexander Samoylov
Alexander Samoylov

Reputation: 2548

For more general case (add a text and newline after/before the match) I recommend using the following commands.
This approach is better than /a sed parameter, because /a does not work on some operating systems or old sed versions.
If REPLACE_STR is empty it will add just a newline after/before the PATTERN_STR, that is the asked question is a particular case (PATTERN_STR=64, REPLACE_STR=).

Adds REPLACE_STR string as a new line after the matched string PATTERN_STR:

sed $'s/PATTERN_STR/&\\\nREPLACE_STR/' file

Adds REPLACE_STR string as a new line before the matched string PATTERN_STR:

sed $'s/PATTERN_STR/REPLACE_STR\\\n&/' file

Upvotes: 0

Ed Morton
Ed Morton

Reputation: 203149

This might be more like what you really need (uses GNU awk for multi-char RS):

$ gawk -v RS='^$' '{gsub(/[[:space:]]+/," "); gsub(/(\<[[:digit:]]+\> bytes|---)/,"\n&"); sub(/^\n/,"")}1' file
64 bytes from 170.198.42.128: icmp_seq=1 ttl=60 time=83.4 ms
64 bytes from 170.198.42.128: icmp_seq=2 ttl=60 time=76.6 ms
64 bytes from 170.198.42.128: icmp_seq=3 ttl=60 time=70.8 ms
64 bytes from 170.198.42.128: icmp_seq=4 ttl=60 time=76.6 ms
--- 170.198.42.128 ping statistics
--- 4 packets transmitted, 4 received, 0% packet loss, time 3000ms rtt min/avg/max/mdev = 70.861/76.924/83.493/4.473 ms

Upvotes: 2

anubhava
anubhava

Reputation: 784898

This sed command should work with both gnu and BSD sed versions:

sed $'s/64/\\\n&/g' file

64 bytes from 170.198.42.128: icmp_seq=1 ttl=60 time=83.4 ms
64 bytes from
170.198.42.128: icmp_seq=2 ttl=60 time=76.6 ms
64 bytes from 170.198.42.128: icmp_seq=3
ttl=60 time=70.8 ms
64 bytes from 170.198.42.128: icmp_seq=4 ttl=60 time=76.6 ms ---
170.198.42.128 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time
3000ms rtt min/avg/max/mdev = 70.861/76.924/83.493/4.473 ms

Update: Here is gnu awk command to do the same:

awk '1' RS='64' ORS='\n64' file

Upvotes: 7

Barmar
Barmar

Reputation: 780688

In a substitution, & in the replacement will be replaced with whatever matched. So:

sed 's/64/\n&/g' file

Upvotes: 9

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