For example, I might want to:
tail -f logfile | grep org.springframework | <command to remove first N characters>
I was thinking that 'tr' might have the ability to do this but I'm not sure.
Thanks in advance stackoverflow geniuses!
-- LES
views:
1469answers:
3
A:
cut' WORKS!
tail -f logfile | grep org.springframework | cut -c 900-
would remove the first 900 characters
'cut' uses 900- to show the 900th character to the end of the line
however
when i pipe all of this through grep i don't get anything :(
LES2
2009-06-09 19:04:58
"cut -c 1-900" will not "remove the first 900 characters" -- it will leave only the first 900 characters. If you want to remove the first 900 chars, use "cut -c 901-"
iammichael
2009-06-09 19:08:04
also it's first 900 characters on each line, per @iammichael's answer
Blair Conrad
2009-06-09 19:09:28
thanks ... i was editing my comment as you guys typed this :)
LES2
2009-06-09 19:16:40
+6
A:
Use cut. Eg. to strip the first 4 characters of each line (i.e. start on the 5th char):
tail -f logfile | grep org.springframework | cut -c 5-
iammichael
2009-06-09 19:06:44
do you have any idea of why the pipe doesn't work? when i run essentially that command, 'cut' doesn't print the results to stdout ... if i just run 'tail -f logfile | cut -c 5-' i can see the results ... the problem must be with grepi'm using cygwin FYIthanks
LES2
2009-06-09 19:15:25
what does happen if you do not add the last pipe and cut ? basically, if you remove the last part of the line ?
LB
2009-06-09 19:21:40
it "tails" the logfile, filtering it with grep (i.e., all of the lines with "org.springframework" in them are printed to stdout)when i add the pipe to 'cut' ... it hangsHOWEVER, if i eliminate 'grep' the 'cut' works properly ... i'm thinking something's wrong with how i'm using grep ... could be a cygwin thing too
LES2
2009-06-09 19:31:09
oh i see...why do you use tail ? just do grep org.springframework logfile | cut -c 5-but i think sed is nicer :-)
LB
2009-06-09 19:57:59
because the '-f' arg to 'tail' causes tail to continuously read the file ... it allows me to view updates to the logfile as they are written
LES2
2009-06-09 20:10:41
+3
A:
sed 's/^.\{5\}//' logfile
and you replace 5 by the number you want...it should do the trick...
EDIT
if for each line
sed 's/^.\{5\}//g' logfile
LB
2009-06-09 19:08:18