notes.txt

# create an array of arrays from the tab delimited file.
foo = [line.rstrip('\r').split('\t')  for line in open("some_file","r")]




#find all the unique versions of a file from an rsnapshot directory
ls -1 /ir-backups/*/remy/di/Sales/programs/bdn_sales.int |
cut -f2 -d' ' |
	while read line; do
		stat --printf="%Y\t%h\t%n\t" $line;
		md5sum <$line;
	done | sort |
awk -F$'\t' '!x[$4]++'




# remove the first line from a file:

cat file | sed 1d


#capture/test parameters:
#!/bin/sh

one=$1
two=$2
three=$3
[[ -n $one && -n $two && -n $three ]] || {
   echo "params not supplied!"
   exit 1
}



n1 -- number lines of files:

http://bash-hackers.org/wiki/doku.php/snipplets/prargs

perl -n -e 'BEGIN { $x=0 }' -e 'chomp; $orig=$_; @fields = split /\|/; $x++; print scalar(@fields)."\t".$x."\t".$orig."\n"'  .bash_history  | sort -n

L=1; ls -1 |head | while read line; do echo -e "$L:\t$line"; L=$((L+1)); done | sed 2,4d


BASH ARRAYS
http://mywiki.wooledge.org/BashFAQ/005
# Read the contents of $THEFILE into $THEARRAY
tmp=$IFS IFS=$'\n' THEARRAY=($(< $THEFILE)) IFS=$tmp



IMG_IN=tmp/Q.jpg
IMG_OUT=tmp/W.jpg
sqlite3 img.db "create table imgs (id INTEGER PRIMARY KEY, img BLOB); insert into imgs (img) values (\"$(base64 -w0 ${IMG_IN})\"); select img from imgs where id=1;" | base64 -d -w0 > ${IMG_OUT}

stu@sente ~/code/base64 $ cat table.txt
0 A 16 Q
1 B 17 R
2 C 18 S

while IFS=$':' read -r -d' ' line; do echo "$line"; done < table.txt | xargs -n2 -d"\n" echo | sort -n

0 A
1 B
2 C
3 D
4 E
5 F
6 G
7 H
8 I
9 J
10 K
11 L
12 M
13 N
14 O
15 P
16 Q
17 R
18 S
19 T
20 U
21 V
22 W