SED – Tikejhya: Ashish Nepal

tail with color

On 15th May 2016

multitail -c /path/to/log

multitail configuration are located at ~/.multitailrc

colorscheme:logname
cs_re:green:TEST
cs_re:red:ERROR

multitail -cS logname /path/to/log

AWK Method:
tail -f /path/to/log | awk ‘/TEST/ {print “\033[32m” $0 “\033[39m”} /ERROR/ {print “\033[31m” $0 “\033[39m”}’

SED Method:
tail -f /path/to/log | sed -e ‘s/$.*TEST.*$/\o033[32m\1\o033[39m/’ -e ‘s/$.*ERROR.*$/\o033[31m\1\o033[39m/’

0

print lines between start and end using awk and sed

By admin

On 4th September 2015

In SED

AWK print pattern

[root@spark ~]# cat testfile
shit lot
of crap
in here
lets see

Awk print line starting with:
[root@spark ~]# awk '$1 ~ /^shit/' testfile
shit lot

sed print line between pattern
[root@spark ~]# sed -n '/shit/,/crap/p' testfile
shit lot
of crap

+2

-3

print lines between start and end using sed

By admin

On 4th September 2015

In SED

print lines between start and end using sed

sed: Print line starting with 201 and ending with 2015
sed -n '/^201/{:start /2015$/!{N;b start};//p}'

How it works:
sed -n '/^STARTPATTERN/{:start /ENDPATTERN$/!{N;b start};//p}'

The “-n” option will not print anything unless an explicit request to print is found. I mentioned the “/p” flag to the substitute command as one way to turn printing back on. Let me clarify this. The command

sed ‘s/PATTERN/&/p’ file
acts like the cat program if PATTERN is not in the file: e.g. nothing is changed. If PATTERN is in the file, then each line that has this is printed twice. Add the “-n” option and the example acts like grep:

sed -n ‘s/PATTERN/&/p’ file
Nothing is printed, except those lines with PATTERN included.

The long argument of the -n command is either

sed –quiet ‘s/PATTERN/&/p’ file
or

sed –silent ‘s/PATTERN/&/p’ file

+3

-1

bash: set with variables inside file

By admin

On 1st September 2014

In SED

sed -i "s#string-to-change.#${replacestring}#g" file.txt

+161

0

Remove All duplicate lines

By admin

On 20th July 2013

In BASH, SED

SED
Remove All duplicate line.

:g/%(^1>.*$n)@<=(k+).*$/d Replace Newline To space :%s/n/ /g

+51

0

Bash Pattern Match

By admin

On 20th July 2013

In BASH, SED

Print before and after Pattern

$ var="abcdefghij0123456789"

$ echo $var abcdefghij0123456789
Now to print 3 characters before the pattern “h” in $var
$ echo $var | awk 'match($0,"h"){print substr($0,RSTART-3,3)}'

Output:
efg

And to print 4 characters after the pattern “h” in $var
$ echo $var | awk 'match($0,"h"){print substr($0,RSTART+1,4)}'

Output:
ij01

Combining, i.e. to print 3 characters before “h” and 4 characters after “h”
$ echo $var | awk 'match($0,"h"){print substr($0,RSTART-3,3),substr($0,RSTART+1,4)}'

Output:
efg ij01

+27

0

SED [Regex]

By admin

On 23rd June 2013

In SED

remove all line starting with string < ^<.*$ SED - remove last four characters from string echo "hello tikejhya whzz" |sed 's/.{4}$//' Sed Delete Empty Line Syntax $ sed '/^$/d' /tmp/data.txt

+49

0

Sed SRC from custom log

By admin

On 17th March 2013

In IPtables, SED

Mar 16 20:00:00 web1 kernel: *WEB_ATTEMPT*IN=eth1 OUT= MAC=00:208:e3:ff:08:00 SRC=111.111.111.111 DST=222.222.222.222 LEN=52 TOS=0x00 PREC=0x00 TTL=41 ID=19880 DF PROTO=TCP SPT=25499 DPT=3306 WINDOW=65453 RES=0x00 ACK URGP=0

sed ‘s/.*SRC=(.*)DST=.*/1/’ /var/log/custom | grep -v kernel | uniq -c

+24

0