removing time stamp from a text file using sed script

Question

127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/ HTTP/1.1" 200 169 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/.treeinfo HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/Fedora HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/Server HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/Client HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/RedHat HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/CentOS HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/SL HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/directory.yast HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/current/images/MANIFEST HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/images/daily/MANIFEST HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/boot/platform/i86xpv/kernel/unix HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/platform/i86xpv/kernel/unix HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/STARTUP/XNLOADER.SYS HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/images/xen/vmlinuz HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/images/boot.iso HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/boot/boot.iso HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/current/images/netboot/mini.iso HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:27 +0530] "HEAD /sk/install/images/boot.iso HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/ HTTP/1.1" 200 169 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/.treeinfo HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
1    27.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/Fedora HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/Server HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/Client HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/RedHat HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/CentOS HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/SL HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/directory.yast HTTP/1.1" 404 182 "-" "Python-urllib/2.6"
127.0.0.1 - - [08/Mar/2011:00:26:35 +0530] "HEAD /sk/current/images/MANIFEST HTTP/1.1" 404 182 "-" "Python-urllib/2.6"

How can I remove date from above logs using a sed script [08/Mar/2011:00:26:35 +0530] like this there are many instances.

Solution 1

You can use:

sed -r 's/\[[0-9]{2}\/[A-Z][a-z]{2}\/[0-9]{4}:[0-9]{2}:[0-9]{2}:[0-9]{2} \+[0-9]+\]//g'

See it on Ideone

Alternatively if there are no other occurrences of [..] in the input you can just do:

sed  's/\[.*\]//g'

Solution 2

If you have Ruby(1.9+)

$ ruby -i.bak -ne 'print $_.gsub(/\[.*?\]/,"")' file

if you absolutely must use sed

$ sed -i.bak 's/\[.[^]]*\]//g' file

Solution 3

The general pattern would be:

sed -e 's/pattern/replacement/' filename

With:

-e command

    Append the editing commands specified by the command argument 
    to the list of commands.

In your case, this could be e.g.:

sed -e 's/\[.*\]//' yourfilename.log

Note that [.*] will work correctly as long as you don't have additional ] characters in a line.