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Why do this awk script print the original file too?

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1

I have following script:

ascript2.awk

#!/usr/bin/awk -f
BEGIN FS=":" 
a[$1]=a[$1] ";" $2 " : " $3
END
for (x in a) print x,a[x] 

When I let it run, it prints also the original intput file. Why?
When I make a bash script like this it works fine:

merge

#!/bin/bash
awk -F' *: *' 'a[$1]=a[$1] (a[$1]?" \ " :" ; ") $2 ":" $3 END for (x in a) print x,a[x]' $1

Input:

Affe : 3 : test
Affe : 5 : test2
Money : 9 : test3

Outputs:

$ ./merge t.txt
Money ; 9:test3
Affe ; 3:test 5:test2

$ ./ascript2.awk t.txt
Affe : 3 : test
Affe : 5 : test2
Money : 9 : test3
Money ; 9 : test3
Affe ; 3 : test; 5 : test2

awk

share|improve this question

edited Mar 28 at 9:21

oguz ismail

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asked Mar 28 at 9:00

Walter SchrabmairWalter Schrabmair

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add a comment | 

1

I have following script:

ascript2.awk

#!/usr/bin/awk -f
BEGIN FS=":" 
a[$1]=a[$1] ";" $2 " : " $3
END
for (x in a) print x,a[x] 

When I let it run, it prints also the original intput file. Why?
When I make a bash script like this it works fine:

merge

#!/bin/bash
awk -F' *: *' 'a[$1]=a[$1] (a[$1]?" \ " :" ; ") $2 ":" $3 END for (x in a) print x,a[x]' $1

Input:

Affe : 3 : test
Affe : 5 : test2
Money : 9 : test3

Outputs:

$ ./merge t.txt
Money ; 9:test3
Affe ; 3:test 5:test2

$ ./ascript2.awk t.txt
Affe : 3 : test
Affe : 5 : test2
Money : 9 : test3
Money ; 9 : test3
Affe ; 3 : test; 5 : test2

awk

share|improve this question

edited Mar 28 at 9:21

oguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

asked Mar 28 at 9:00

Walter SchrabmairWalter Schrabmair

45711 gold badge66 silver badges1818 bronze badges

add a comment | 

I have following script:

ascript2.awk

#!/usr/bin/awk -f
BEGIN FS=":" 
a[$1]=a[$1] ";" $2 " : " $3
END
for (x in a) print x,a[x] 

When I let it run, it prints also the original intput file. Why?
When I make a bash script like this it works fine:

merge

#!/bin/bash
awk -F' *: *' 'a[$1]=a[$1] (a[$1]?" \ " :" ; ") $2 ":" $3 END for (x in a) print x,a[x]' $1

Input:

Affe : 3 : test
Affe : 5 : test2
Money : 9 : test3

Outputs:

$ ./merge t.txt
Money ; 9:test3
Affe ; 3:test 5:test2

$ ./ascript2.awk t.txt
Affe : 3 : test
Affe : 5 : test2
Money : 9 : test3
Money ; 9 : test3
Affe ; 3 : test; 5 : test2

awk

share|improve this question

edited Mar 28 at 9:21

oguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

asked Mar 28 at 9:00

Walter SchrabmairWalter Schrabmair

45711 gold badge66 silver badges1818 bronze badges

#!/usr/bin/awk -f
BEGIN FS=":" 
a[$1]=a[$1] ";" $2 " : " $3
END
for (x in a) print x,a[x] 

#!/bin/bash
awk -F' *: *' 'a[$1]=a[$1] (a[$1]?" \ " :" ; ") $2 ":" $3 END for (x in a) print x,a[x]' $1

Affe : 3 : test
Affe : 5 : test2
Money : 9 : test3

$ ./merge t.txt
Money ; 9:test3
Affe ; 3:test 5:test2

$ ./ascript2.awk t.txt
Affe : 3 : test
Affe : 5 : test2
Money : 9 : test3
Money ; 9 : test3
Affe ; 3 : test; 5 : test2

share|improve this question

edited Mar 28 at 9:21

oguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

asked Mar 28 at 9:00

Walter SchrabmairWalter Schrabmair

45711 gold badge66 silver badges1818 bronze badges

share|improve this question

edited Mar 28 at 9:21

oguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

asked Mar 28 at 9:00

Walter SchrabmairWalter Schrabmair

45711 gold badge66 silver badges1818 bronze badges

edited Mar 28 at 9:21

oguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

edited Mar 28 at 9:21

oguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

asked Mar 28 at 9:00

Walter SchrabmairWalter Schrabmair

45711 gold badge66 silver badges1818 bronze badges

asked Mar 28 at 9:00

Walter SchrabmairWalter Schrabmair

45711 gold badge66 silver badges1818 bronze badges

1 Answer
1

active

oldest

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4

In ascript2.awk, a[$1]=a[$1] ";" $2 " : " $3 should be enclosed in curly braces, otherwise it will be interpreted as a condition with no action, and any condition without an action will print the line if and only the condition is met. (See: what is the meaning of 1 at the end of awk script
)

So your script should look this:

#!/usr/bin/awk -f
BEGIN FS=":" 
 a[$1] = a[$1] ";" $2 " : " $3 
END for (x in a) print x, a[x] 

share|improve this answer

answered Mar 28 at 9:20

oguz ismailoguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

add a comment | 

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4

In ascript2.awk, a[$1]=a[$1] ";" $2 " : " $3 should be enclosed in curly braces, otherwise it will be interpreted as a condition with no action, and any condition without an action will print the line if and only the condition is met. (See: what is the meaning of 1 at the end of awk script
)

So your script should look this:

#!/usr/bin/awk -f
BEGIN FS=":" 
 a[$1] = a[$1] ";" $2 " : " $3 
END for (x in a) print x, a[x] 

share|improve this answer

answered Mar 28 at 9:20

oguz ismailoguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

add a comment | 

4

In ascript2.awk, a[$1]=a[$1] ";" $2 " : " $3 should be enclosed in curly braces, otherwise it will be interpreted as a condition with no action, and any condition without an action will print the line if and only the condition is met. (See: what is the meaning of 1 at the end of awk script
)

So your script should look this:

#!/usr/bin/awk -f
BEGIN FS=":" 
 a[$1] = a[$1] ";" $2 " : " $3 
END for (x in a) print x, a[x] 

share|improve this answer

answered Mar 28 at 9:20

oguz ismailoguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

add a comment | 

In ascript2.awk, a[$1]=a[$1] ";" $2 " : " $3 should be enclosed in curly braces, otherwise it will be interpreted as a condition with no action, and any condition without an action will print the line if and only the condition is met. (See: what is the meaning of 1 at the end of awk script
)

So your script should look this:

#!/usr/bin/awk -f
BEGIN FS=":" 
 a[$1] = a[$1] ";" $2 " : " $3 
END for (x in a) print x, a[x] 

share|improve this answer

answered Mar 28 at 9:20

oguz ismailoguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

#!/usr/bin/awk -f
BEGIN FS=":" 
 a[$1] = a[$1] ";" $2 " : " $3 
END for (x in a) print x, a[x] 

share|improve this answer

answered Mar 28 at 9:20

oguz ismailoguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

answered Mar 28 at 9:20

oguz ismailoguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges

answered Mar 28 at 9:20

oguz ismailoguz ismail

12.2k77 gold badges1818 silver badges3737 bronze badges