bash

Column width in bash environment

Submitted by admin on Sat, 2008-03-29 22:42.

export COLUMNS=150

Clear the whole Postfix mail queue

Submitted by admin on Fri, 2008-02-22 15:07.

~# for i in `mailq|grep '@' |awk {'print $1'}|grep -v '@'`; do postsuper -d $i ; done

Thomas Sewell from coolsewell.com contributed with this helpful notes:

Split big files for editing

Submitted by admin on Tue, 2008-01-15 14:13.

If you need to edit a big file, for example a mysql full dump for recover a single database, and your editor, for example emacs, say
something like "Maximum buffer size exceeded" you can split it in many smaller files.

~$ split -b 100m ORIGINAL_BIG_FILE OUTPUT_FILE_NAME

Output files will be:

OUTPUT_FILE_NAMEaa
OUTPUT_FILE_NAMEab
OUTPUT_FILE_NAMEac

and on ... every one 100MB weight.

Then you can edit and just keep your DB for restore.

How do you rename files with a certain pattern in bash?

Submitted by admin on Mon, 2006-05-29 09:25.

How do you rename files with a certain pattern in bash?

for i in *ABC*
do
new=$ ( echo $i | sed ’s/ABC/DEF/’ )
mv $i $new
done

Thanks Live from Yokohama

Print all ANSI colors

Submitted by admin on Mon, 2006-05-08 07:59.

(from http://wiki.splitbrain.org/shellsnippets)

for i in 30 31 32 33 34 35 36 37 39
do
for j in 40 41 42 43 44 45 46 47 49
do
   # skip if same fore- and backgroundcolor
   if [ $j -eq $[ i + 10 ] ]; then
     continue
   fi
   echo -e $i $j "\033[${i};${j}mCOLOR\033[0m"
done
done

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