ahmedre ahmed el-helw

Jaikus from ahmedre

Monday, 13 April 2009
moved to identi.ca - http://identi.ca/aretips

By ahmedre 2 months, 3 weeks ago Add Comment
Tuesday, 7 April 2009
`sudo tcpdump -n dst port 80 -c 5 -A -s 0` dump entire packets heading to port 80 (stopping after 5 packets).

By ahmedre 2 months, 3 weeks ago Add Comment
Monday, 16 March 2009
base conversion using bc - `echo "ibase=16;obase=A;CAFE" | bc` to convert 0xCAFE to base 10.

By ahmedre 3 months, 2 weeks ago Add Comment
`awk '{s+=$1} END {print s}'` sums a list of numbers - really useful.

By ahmedre 3 months, 2 weeks ago Add Comment
Tuesday, 10 March 2009
`i=foo.jpg echo ${i/.jpg}` would remove the .jpg extension from i, thus returning foo. useful for renaming file extensions in a loop.

By ahmedre 3 months, 3 weeks ago Add Comment
Saturday, 3 January 2009
wget -i equiv using bash and curl: while read line; do curl -O $line; done < urls

By ahmedre 6 months ago Add Comment
Saturday, 6 December 2008
coworker pointed out that with a recent version of coreutils, you can also do date -d @ 1207784720 on linux [no space between the @ and the timestamp].

Comment from ahmedre on perl -e 'print scalar localtime 1207784720;' can be used when date -r doesn't exist (ie linux). courtesy of my coworker. by 7 months ago
Monday, 24 November 2008
perl -e 'print scalar localtime 1207784720;' can be used when date -r doesn't exist (ie linux). courtesy of my coworker.

By ahmedre 7 months, 1 week ago 1 Comment
Thursday, 20 November 2008
even easier - use the -w flag. for example, seq -w 1 114.

Comment from ahmedre on in bash, seq(1) is useful in loops: for i in `seq -f"%03g" 1 114`; do ls $i*; done [source: tldp.org] by 7 months, 2 weeks ago
Monday, 17 November 2008
`echo -e "GET / HTTP/1.0\r\nHost: subdomain.domain.com\r\n\r\n" | nc domain.com 80` really helps in testing webserver config changes!

By ahmedre 7 months, 2 weeks ago Add Comment
Thursday, 23 October 2008
use `/System/Library/CoreServices/"Menu Extras"/User.menu/Contents/Resources/CGSession -suspend` in osx to lock the screen.

By ahmedre 8 months, 1 week ago Add Comment
Monday, 20 October 2008
use `dig nameserver -t A domain` to get dns information about a particular domain, cache expiration time, etc.

By ahmedre 8 months, 2 weeks ago Add Comment
Tuesday, 16 September 2008
in vim, :.,+2s/foo/bar/g would replace foo with bar in this line and the next two lines.

By ahmedre 9 months, 3 weeks ago Add Comment
Sunday, 31 August 2008
to resize/convert images, use imagemagick and bash like this: `for i in $( ls *.JPG ); do convert $i -resize 33% new/$i.jpg; done`

By ahmedre 10 months, 1 week ago Add Comment
Wednesday, 20 August 2008
in vim, :set ff=unix to switch a file to unix format, and :set ff=dos to switch it to dos format. [source: lunix.com.au]

By ahmedre 10 months, 2 weeks ago Add Comment
Tuesday, 12 August 2008
in vim, %s/const char\ \(\w\+\);/const char \1 = "";/g would replace all "const char var;" to 'const char var = "";'

By ahmedre 10 months, 3 weeks ago Add Comment
Thursday, 24 July 2008
in bash, seq(1) is useful in loops: for i in `seq -f"%03g" 1 114`; do ls $i*; done [source: tldp.org]

By ahmedre 11 months, 2 weeks ago 1 Comment
Friday, 30 May 2008
`curl -O http://url/[001-114].ext` saves me from writing perl scripts or bash for loops!

By ahmedre 1 year, 1 month ago Add Comment
Thursday, 29 May 2008
after running a command and realizing you need to run it with sudo, just do a 'sudo !!' to rerun it with sudo. courtesy of shell-fu.org.

By ahmedre 1 year, 1 month ago Add Comment

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