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Getting the first word using sed,awk or perl

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# 1  
Old 08-21-2010
Getting the first word using sed,awk or perl
Input:
Code:
root:x:0:
daemon:x:1:
bin:x:2:
sys:x:3:
adm:x:4:
tty:x:5:
disk:x:6:
lp:x:7:
mail:x:8:

Output:
Code:
root
daemon
bin
sys
adm
tty
disk
lp
mail

# 2  
Old 08-21-2010
Code:
sed "s/:.*//"

This User Gave Thanks to Scott For This Post:
cola
# 3  
Old 08-21-2010
Code:
awk -F: '{print $1}' infile

This User Gave Thanks to kevintse For This Post:
cola
# 4  
Old 08-22-2010
Shorter one Smilie
Code:
awk -F: '$0=$1' file

or
Code:
cut -d: -f1 file

This User Gave Thanks to danmero For This Post:
cola
# 5  
Old 08-22-2010
Code:
perl -F: -lane 'print $F[0]'  infile

# 6  
Old 08-22-2010
Code:
# sed 's/\([^:]*\).*/\1/' infile
root
daemon
bin
sys
adm
tty
disk
lp
mail

# 7  
Old 08-23-2010
Code:
while IFS=":" read -r c1 c2
do
  echo "$c1"
done < myfile
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