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How to convert a sequence of hexadecimal numbers to characters in a script shell?

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1

my script hex.sh

#!/bin/sh
if [ -f $file_name ]
then do 
 cat[$file_name] | xxd -r -p
 else 
echo "$file_name not exists"
fi

The file must either be an existing file or '-' to read from the standard input.

---

The result should be :

./hex.sh test_number
017 AAA

---

test_number might contain :

30 31 37 20 41 41 41 20 0A

linux bash shell-script shell

share|improve this question

edited Mar 28 at 0:38

Rui F Ribeiro

42k1483142

asked Mar 27 at 13:58

ZPUFF19ZPUFF19

84

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  See also Conversion hex string into ascii in bash command line
  
  – Sjoerd
  Mar 27 at 14:00
  

  
  
  
  

add a comment | 

1

my script hex.sh

#!/bin/sh
if [ -f $file_name ]
then do 
 cat[$file_name] | xxd -r -p
 else 
echo "$file_name not exists"
fi

The file must either be an existing file or '-' to read from the standard input.

---

The result should be :

./hex.sh test_number
017 AAA

---

test_number might contain :

30 31 37 20 41 41 41 20 0A

linux bash shell-script shell

share|improve this question

edited Mar 28 at 0:38

Rui F Ribeiro

42k1483142

asked Mar 27 at 13:58

ZPUFF19ZPUFF19

84

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  See also Conversion hex string into ascii in bash command line
  
  – Sjoerd
  Mar 27 at 14:00
  

  
  
  
  

add a comment | 

my script hex.sh

#!/bin/sh
if [ -f $file_name ]
then do 
 cat[$file_name] | xxd -r -p
 else 
echo "$file_name not exists"
fi

The file must either be an existing file or '-' to read from the standard input.

---

The result should be :

./hex.sh test_number
017 AAA

---

test_number might contain :

30 31 37 20 41 41 41 20 0A

linux bash shell-script shell

share|improve this question

edited Mar 28 at 0:38

Rui F Ribeiro

42k1483142

asked Mar 27 at 13:58

ZPUFF19ZPUFF19

84

#!/bin/sh
if [ -f $file_name ]
then do 
 cat[$file_name] | xxd -r -p
 else 
echo "$file_name not exists"
fi

./hex.sh test_number
017 AAA

30 31 37 20 41 41 41 20 0A

share|improve this question

edited Mar 28 at 0:38

Rui F Ribeiro

42k1483142

asked Mar 27 at 13:58

ZPUFF19ZPUFF19

84

share|improve this question

edited Mar 28 at 0:38

Rui F Ribeiro

42k1483142

asked Mar 27 at 13:58

ZPUFF19ZPUFF19

84

edited Mar 28 at 0:38

Rui F Ribeiro

42k1483142

edited Mar 28 at 0:38

Rui F Ribeiro

42k1483142

asked Mar 27 at 13:58

ZPUFF19ZPUFF19

84

asked Mar 27 at 13:58

ZPUFF19ZPUFF19

84

1 Answer
1

active

oldest

votes

1

I came up with the following for this:

#!/bin/sh

if [ "$1" = '-' ]; then
 file='/dev/stdin'
else
 if [ ! -f "$1" ]; then
 printf 'ERROR! Cannot find filen' >&2
 exit 1
 else
 file=$1
 fi
fi

while read -r num; do
 printf '%sn' "$num" | xxd -r -p
 echo
done < "$file"

• If the first positional parameter is - we will read from stdin


• Otherwise we check if the first argument is a valid file. If it is we will read from it, if not we will error and exit.


• We will read each line either from stdin or the file and set the line to the num variable


• we will pass the num variable to xxd to convert it


• echo here to ensure a newline is added after each result

With file:

$ cat test_number
30 31 37 20 41 41 41 20 0A
30 31 37 20 41 41 41
30 31 37 20 42 42 42
30 31 37 20 43 43 43
42 45 45 46
$ ./hex.sh test_number
017 AAA

017 AAA
017 BBB
017 CCC
BEEF

From stdin:

$ ./hex.sh -
30 31 37 20 41 41 41 20 0A
017 AAA

42 45 45 46
BEEF
^C
$

share|improve this answer

answered Mar 27 at 14:23

Jesse_bJesse_b

14.4k33574

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ZPUFF19: I'm not sure if you are asking a question or making a statement. If you need to change your requirements please edit your question or ask another.
  
  – Jesse_b
  Mar 27 at 14:46
  

  
  
  
  

add a comment | 

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1

I came up with the following for this:

#!/bin/sh

if [ "$1" = '-' ]; then
 file='/dev/stdin'
else
 if [ ! -f "$1" ]; then
 printf 'ERROR! Cannot find filen' >&2
 exit 1
 else
 file=$1
 fi
fi

while read -r num; do
 printf '%sn' "$num" | xxd -r -p
 echo
done < "$file"

• If the first positional parameter is - we will read from stdin


• Otherwise we check if the first argument is a valid file. If it is we will read from it, if not we will error and exit.


• We will read each line either from stdin or the file and set the line to the num variable


• we will pass the num variable to xxd to convert it


• echo here to ensure a newline is added after each result

With file:

$ cat test_number
30 31 37 20 41 41 41 20 0A
30 31 37 20 41 41 41
30 31 37 20 42 42 42
30 31 37 20 43 43 43
42 45 45 46
$ ./hex.sh test_number
017 AAA

017 AAA
017 BBB
017 CCC
BEEF

From stdin:

$ ./hex.sh -
30 31 37 20 41 41 41 20 0A
017 AAA

42 45 45 46
BEEF
^C
$

share|improve this answer

answered Mar 27 at 14:23

Jesse_bJesse_b

14.4k33574

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ZPUFF19: I'm not sure if you are asking a question or making a statement. If you need to change your requirements please edit your question or ask another.
  
  – Jesse_b
  Mar 27 at 14:46
  

  
  
  
  

add a comment | 

1

I came up with the following for this:

#!/bin/sh

if [ "$1" = '-' ]; then
 file='/dev/stdin'
else
 if [ ! -f "$1" ]; then
 printf 'ERROR! Cannot find filen' >&2
 exit 1
 else
 file=$1
 fi
fi

while read -r num; do
 printf '%sn' "$num" | xxd -r -p
 echo
done < "$file"

• If the first positional parameter is - we will read from stdin


• Otherwise we check if the first argument is a valid file. If it is we will read from it, if not we will error and exit.


• We will read each line either from stdin or the file and set the line to the num variable


• we will pass the num variable to xxd to convert it


• echo here to ensure a newline is added after each result

With file:

$ cat test_number
30 31 37 20 41 41 41 20 0A
30 31 37 20 41 41 41
30 31 37 20 42 42 42
30 31 37 20 43 43 43
42 45 45 46
$ ./hex.sh test_number
017 AAA

017 AAA
017 BBB
017 CCC
BEEF

From stdin:

$ ./hex.sh -
30 31 37 20 41 41 41 20 0A
017 AAA

42 45 45 46
BEEF
^C
$

share|improve this answer

answered Mar 27 at 14:23

Jesse_bJesse_b

14.4k33574

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ZPUFF19: I'm not sure if you are asking a question or making a statement. If you need to change your requirements please edit your question or ask another.
  
  – Jesse_b
  Mar 27 at 14:46
  

  
  
  
  

add a comment | 

I came up with the following for this:

#!/bin/sh

if [ "$1" = '-' ]; then
 file='/dev/stdin'
else
 if [ ! -f "$1" ]; then
 printf 'ERROR! Cannot find filen' >&2
 exit 1
 else
 file=$1
 fi
fi

while read -r num; do
 printf '%sn' "$num" | xxd -r -p
 echo
done < "$file"

• If the first positional parameter is - we will read from stdin


• Otherwise we check if the first argument is a valid file. If it is we will read from it, if not we will error and exit.


• We will read each line either from stdin or the file and set the line to the num variable


• we will pass the num variable to xxd to convert it


• echo here to ensure a newline is added after each result

With file:

$ cat test_number
30 31 37 20 41 41 41 20 0A
30 31 37 20 41 41 41
30 31 37 20 42 42 42
30 31 37 20 43 43 43
42 45 45 46
$ ./hex.sh test_number
017 AAA

017 AAA
017 BBB
017 CCC
BEEF

From stdin:

$ ./hex.sh -
30 31 37 20 41 41 41 20 0A
017 AAA

42 45 45 46
BEEF
^C
$

share|improve this answer

answered Mar 27 at 14:23

Jesse_bJesse_b

14.4k33574

#!/bin/sh

if [ "$1" = '-' ]; then
 file='/dev/stdin'
else
 if [ ! -f "$1" ]; then
 printf 'ERROR! Cannot find filen' >&2
 exit 1
 else
 file=$1
 fi
fi

while read -r num; do
 printf '%sn' "$num" | xxd -r -p
 echo
done < "$file"

$ cat test_number
30 31 37 20 41 41 41 20 0A
30 31 37 20 41 41 41
30 31 37 20 42 42 42
30 31 37 20 43 43 43
42 45 45 46
$ ./hex.sh test_number
017 AAA

017 AAA
017 BBB
017 CCC
BEEF

$ ./hex.sh -
30 31 37 20 41 41 41 20 0A
017 AAA

42 45 45 46
BEEF
^C
$

share|improve this answer

answered Mar 27 at 14:23

Jesse_bJesse_b

14.4k33574

answered Mar 27 at 14:23

Jesse_bJesse_b

14.4k33574

answered Mar 27 at 14:23

Jesse_bJesse_b

14.4k33574