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Need Desire output using shell [on hold]

-5

I need to get desired output using a shell script.

Input:

aaabbcaaabbcc 

Desired Output:

a3b2ca3b2c2 

Command should print number of occurrence of each alphabet only when it's greater than 1, i.e aaab should come as a3b.

I tried with below commands and they didn't work for me, as I have to pass characters manually to my command.

echo "aaabbcaaabbcc" | grep -o a 
echo "aaabbcaaabbcc" | uniq -c 
echo "aaabbcaaabbcc" | grep -o a | uniq -c 

I am unable to find how I can split it character-wise and then check number of occurrences.

shell-script text-processing

share|improve this question

edited 13 hours ago

Jeff Schaller

43.9k1161141

asked 2 days ago

MachineMachine

335

put on hold as unclear what you're asking by Kusalananda, JdeBP, Jeff Schaller, jimmij, Mr Shunz 2 days ago

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  1) Where is the input coming from? Is it the contents of a text file? The output of a command or application? 2) What have you tried to do? If you just want to replace the string in the input with the string in the desired output then you don't need a shell script. Have a look at the sed command.
  
  – Nasir Riley
  2 days ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You seem to want to implement some form run-length encoding. What issues are you having with doing this?
  
  – Kusalananda
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There are far too many possible answers with this incomplete and underspecified question, starting with echo a3b2ca3b2c2.
  
  – JdeBP
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Related: rosettacode.org/wiki/Run-length_encoding
  
  – Kusalananda
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Machine Run-length encoding (RLE) is a well known and simple way of compressing highly redundant data. If you have a particular issue with the awk variant on the Rosetta page that I linked to, then you may want to ask another question about it. Pure programming questions relating to the implementation of specific algorithms would arguably be more suitable on StackOverflow though.
  
  – Kusalananda
  13 hours ago
  
  

  
  
  
  

 | 
show 3 more comments

-5

I need to get desired output using a shell script.

Input:

aaabbcaaabbcc 

Desired Output:

a3b2ca3b2c2 

Command should print number of occurrence of each alphabet only when it's greater than 1, i.e aaab should come as a3b.

I tried with below commands and they didn't work for me, as I have to pass characters manually to my command.

echo "aaabbcaaabbcc" | grep -o a 
echo "aaabbcaaabbcc" | uniq -c 
echo "aaabbcaaabbcc" | grep -o a | uniq -c 

I am unable to find how I can split it character-wise and then check number of occurrences.

shell-script text-processing

share|improve this question

edited 13 hours ago

Jeff Schaller

43.9k1161141

asked 2 days ago

MachineMachine

335

put on hold as unclear what you're asking by Kusalananda, JdeBP, Jeff Schaller, jimmij, Mr Shunz 2 days ago

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  1) Where is the input coming from? Is it the contents of a text file? The output of a command or application? 2) What have you tried to do? If you just want to replace the string in the input with the string in the desired output then you don't need a shell script. Have a look at the sed command.
  
  – Nasir Riley
  2 days ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You seem to want to implement some form run-length encoding. What issues are you having with doing this?
  
  – Kusalananda
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There are far too many possible answers with this incomplete and underspecified question, starting with echo a3b2ca3b2c2.
  
  – JdeBP
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Related: rosettacode.org/wiki/Run-length_encoding
  
  – Kusalananda
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Machine Run-length encoding (RLE) is a well known and simple way of compressing highly redundant data. If you have a particular issue with the awk variant on the Rosetta page that I linked to, then you may want to ask another question about it. Pure programming questions relating to the implementation of specific algorithms would arguably be more suitable on StackOverflow though.
  
  – Kusalananda
  13 hours ago
  
  

  
  
  
  

 | 
show 3 more comments

I need to get desired output using a shell script.

Input:

aaabbcaaabbcc 

Desired Output:

a3b2ca3b2c2 

Command should print number of occurrence of each alphabet only when it's greater than 1, i.e aaab should come as a3b.

I tried with below commands and they didn't work for me, as I have to pass characters manually to my command.

echo "aaabbcaaabbcc" | grep -o a 
echo "aaabbcaaabbcc" | uniq -c 
echo "aaabbcaaabbcc" | grep -o a | uniq -c 

I am unable to find how I can split it character-wise and then check number of occurrences.

shell-script text-processing

share|improve this question

edited 13 hours ago

Jeff Schaller

43.9k1161141

asked 2 days ago

MachineMachine

335

aaabbcaaabbcc 

a3b2ca3b2c2 

echo "aaabbcaaabbcc" | grep -o a 
echo "aaabbcaaabbcc" | uniq -c 
echo "aaabbcaaabbcc" | grep -o a | uniq -c 

share|improve this question

edited 13 hours ago

Jeff Schaller

43.9k1161141

asked 2 days ago

MachineMachine

335

share|improve this question

edited 13 hours ago

Jeff Schaller

43.9k1161141

asked 2 days ago

MachineMachine

335

edited 13 hours ago

Jeff Schaller

43.9k1161141

edited 13 hours ago

Jeff Schaller

43.9k1161141

asked 2 days ago

MachineMachine

335

asked 2 days ago

MachineMachine

335

1 Answer
1

active

oldest

votes

2

str="aaabbcaaabbcc"

echo $str | fold -w1 | uniq -c | 
while read count char; do
 if [ $count -gt 1 ]; then
 printf "$char$count"
 else
 printf "$char"
 fi
done

a3b2ca3b2c2

share|improve this answer

edited 2 days ago

answered 2 days ago

Fedor DikarevFedor Dikarev

1,103310

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There seems to be a special case for $count -eq 1
  
  – nohillside
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Indeed. Fixed for that case.
  
  – Fedor Dikarev
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This would unfortunately fail if the string contained backslashes or percentage signs, or filename globbing patterns, or started with a dash, or if IFS was set to a set of digits or letters.
  
  – Kusalananda
  2 days ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ Fedor Dikarev , I never knew about fold which can split a word vertically in char form. Thanks for this
  
  – Machine
  13 hours ago
  

  
  
  
  

add a comment | 

2

str="aaabbcaaabbcc"

echo $str | fold -w1 | uniq -c | 
while read count char; do
 if [ $count -gt 1 ]; then
 printf "$char$count"
 else
 printf "$char"
 fi
done

a3b2ca3b2c2

share|improve this answer

edited 2 days ago

answered 2 days ago

Fedor DikarevFedor Dikarev

1,103310

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There seems to be a special case for $count -eq 1
  
  – nohillside
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Indeed. Fixed for that case.
  
  – Fedor Dikarev
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This would unfortunately fail if the string contained backslashes or percentage signs, or filename globbing patterns, or started with a dash, or if IFS was set to a set of digits or letters.
  
  – Kusalananda
  2 days ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ Fedor Dikarev , I never knew about fold which can split a word vertically in char form. Thanks for this
  
  – Machine
  13 hours ago
  

  
  
  
  

add a comment | 

2

str="aaabbcaaabbcc"

echo $str | fold -w1 | uniq -c | 
while read count char; do
 if [ $count -gt 1 ]; then
 printf "$char$count"
 else
 printf "$char"
 fi
done

a3b2ca3b2c2

share|improve this answer

edited 2 days ago

answered 2 days ago

Fedor DikarevFedor Dikarev

1,103310

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There seems to be a special case for $count -eq 1
  
  – nohillside
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Indeed. Fixed for that case.
  
  – Fedor Dikarev
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This would unfortunately fail if the string contained backslashes or percentage signs, or filename globbing patterns, or started with a dash, or if IFS was set to a set of digits or letters.
  
  – Kusalananda
  2 days ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ Fedor Dikarev , I never knew about fold which can split a word vertically in char form. Thanks for this
  
  – Machine
  13 hours ago
  

  
  
  
  

add a comment | 

str="aaabbcaaabbcc"

echo $str | fold -w1 | uniq -c | 
while read count char; do
 if [ $count -gt 1 ]; then
 printf "$char$count"
 else
 printf "$char"
 fi
done

a3b2ca3b2c2

share|improve this answer

edited 2 days ago

answered 2 days ago

Fedor DikarevFedor Dikarev

1,103310

str="aaabbcaaabbcc"

echo $str | fold -w1 | uniq -c | 
while read count char; do
 if [ $count -gt 1 ]; then
 printf "$char$count"
 else
 printf "$char"
 fi
done

share|improve this answer

edited 2 days ago

answered 2 days ago

Fedor DikarevFedor Dikarev

1,103310

answered 2 days ago

Fedor DikarevFedor Dikarev

1,103310

answered 2 days ago

Fedor DikarevFedor Dikarev

1,103310