How to test whether wc -l is even or odd in shell?

up vote
0
down vote

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say I have a file called file1

$ a=$(wc -c file1)
$ echo $a
233 file1

now how would I do this

$ b=$(expr $a % 2)
$ echo $b
1

I guess the file1 in wc -c make's this crash?

asked Feb 26 at 0:35

Tinler

1295

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up vote
0
down vote

favorite

say I have a file called file1

$ a=$(wc -c file1)
$ echo $a
233 file1

now how would I do this

$ b=$(expr $a % 2)
$ echo $b
1

I guess the file1 in wc -c make's this crash?

asked Feb 26 at 0:35

Tinler

1295

add a commentÂ |Â

up vote
0
down vote

favorite

say I have a file called file1

$ a=$(wc -c file1)
$ echo $a
233 file1

now how would I do this

$ b=$(expr $a % 2)
$ echo $b
1

I guess the file1 in wc -c make's this crash?

asked Feb 26 at 0:35

Tinler

1295

say I have a file called file1

$ a=$(wc -c file1)
$ echo $a
233 file1

now how would I do this

$ b=$(expr $a % 2)
$ echo $b
1

I guess the file1 in wc -c make's this crash?

asked Feb 26 at 0:35

Tinler

1295

asked Feb 26 at 0:35

Tinler

1295

asked Feb 26 at 0:35

Tinler

1295

asked Feb 26 at 0:35

Tinler

1295

add a commentÂ |Â

3 Answers
3

active

oldest

votes

up vote
1
down vote

accepted

Another way to remove the filename from wc is to use wc -c <file1. This avoids the requirement of a second process cat.

answered Feb 26 at 0:41

dsstorefile1

1,576212

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up vote
2
down vote

I would use something like:

if [ $(( $(wc -c < your-filehere ) % 2)) -eq 1 ]
then 
 echo file has odd number of bytes
else 
 echo file has even number of bytes
fi

answered Feb 26 at 1:15

Jeff Schaller

31.2k846105

add a commentÂ |Â

up vote
0
down vote

One way to go:

a=$(cat file1 | wc -c)

this doesn't output the file name and your expr will work.

answered Feb 26 at 0:39

man0v

30917

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

up vote
1
down vote

accepted

Another way to remove the filename from wc is to use wc -c <file1. This avoids the requirement of a second process cat.

answered Feb 26 at 0:41

dsstorefile1

1,576212

add a commentÂ |Â

up vote
1
down vote

accepted

Another way to remove the filename from wc is to use wc -c <file1. This avoids the requirement of a second process cat.

answered Feb 26 at 0:41

dsstorefile1

1,576212

add a commentÂ |Â

up vote
1
down vote

accepted

Another way to remove the filename from wc is to use wc -c <file1. This avoids the requirement of a second process cat.

answered Feb 26 at 0:41

dsstorefile1

1,576212

Another way to remove the filename from wc is to use wc -c <file1. This avoids the requirement of a second process cat.

answered Feb 26 at 0:41

dsstorefile1

1,576212

answered Feb 26 at 0:41

dsstorefile1

1,576212

answered Feb 26 at 0:41

dsstorefile1

1,576212

answered Feb 26 at 0:41

dsstorefile1

1,576212

add a commentÂ |Â

up vote
2
down vote

I would use something like:

if [ $(( $(wc -c < your-filehere ) % 2)) -eq 1 ]
then 
 echo file has odd number of bytes
else 
 echo file has even number of bytes
fi

answered Feb 26 at 1:15

Jeff Schaller

31.2k846105

add a commentÂ |Â

up vote
2
down vote

I would use something like:

if [ $(( $(wc -c < your-filehere ) % 2)) -eq 1 ]
then 
 echo file has odd number of bytes
else 
 echo file has even number of bytes
fi

answered Feb 26 at 1:15

Jeff Schaller

31.2k846105

add a commentÂ |Â

up vote
2
down vote

I would use something like:

if [ $(( $(wc -c < your-filehere ) % 2)) -eq 1 ]
then 
 echo file has odd number of bytes
else 
 echo file has even number of bytes
fi

answered Feb 26 at 1:15

Jeff Schaller

31.2k846105

I would use something like:

if [ $(( $(wc -c < your-filehere ) % 2)) -eq 1 ]
then 
 echo file has odd number of bytes
else 
 echo file has even number of bytes
fi

answered Feb 26 at 1:15

Jeff Schaller

31.2k846105

answered Feb 26 at 1:15

Jeff Schaller

31.2k846105

answered Feb 26 at 1:15

Jeff Schaller

31.2k846105

answered Feb 26 at 1:15

Jeff Schaller

31.2k846105

add a commentÂ |Â

up vote
0
down vote

One way to go:

a=$(cat file1 | wc -c)

this doesn't output the file name and your expr will work.

answered Feb 26 at 0:39

man0v

30917

add a commentÂ |Â

up vote
0
down vote

One way to go:

a=$(cat file1 | wc -c)

this doesn't output the file name and your expr will work.

answered Feb 26 at 0:39

man0v

30917

add a commentÂ |Â

up vote
0
down vote

One way to go:

a=$(cat file1 | wc -c)

this doesn't output the file name and your expr will work.

answered Feb 26 at 0:39

man0v

30917

One way to go:

a=$(cat file1 | wc -c)

this doesn't output the file name and your expr will work.

answered Feb 26 at 0:39

man0v

30917

answered Feb 26 at 0:39

man0v

30917

answered Feb 26 at 0:39

man0v

30917

answered Feb 26 at 0:39

man0v

30917

add a commentÂ |Â

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