Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Replace 10 characters in file

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Replace 10 characters in file
# 1  
Old 11-28-2009
Question Replace 10 characters in file
Hi,

I need to replace 10 characters string (21-30) in a file with another string.

I tried using cut command, i am able get these 10 charaters, but do not know how to replace them inside the file.

for example file content(these are alphanumeric characters):
aaaaa12345bbbbb12345ccccc12345ddddd12345eeeee12345

cut -c 21-30 filename

Any Help?
# 2  
Old 11-28-2009
using bash
Code:
sub="0123456789"  # ten characters
while read record
do
   echo ${record:0:19}${sub}${record:29}
done < inputfile > outputfile

The syntax is ${stringSmilieos:length} - pos starts counting from 0.
# 3  
Old 11-29-2009
One way to do it with Perl:

Code:
$
$ cat f6
aaaaa12345bbbbb12345ccccc12345ddddd12345eeeee12345
$ perl -i.bak -pe 'substr($_,20,10)="0123456789"' f6
$ cat f6
aaaaa12345bbbbb123450123456789ddddd12345eeeee12345
$
$ # A copy of the original file - "f6" is saved in "f6.bak"
$

tyler_durden
# 4  
Old 11-29-2009
Code:
sed 's/\(^.\{20\}\).\{10\}/\1ABCDEFGHIJ/' urfile

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Need to replace new line characters in a huge file

Hi , I would like to replace new line characters(\n) in a huge file of about 2 million records . I tried this one (:%s/\n//g) but it's hanging there and no result. Does this command do not work if the file is big. Please let me know if you have any other options Regards Raj (1 Reply)
Discussion started by: rajeevm
1 Replies

2. Shell Programming and Scripting

How to replace characters in a file?

Hi Gurus, I need replace some charactors in a file. in following example. I need replace from 4th charactor to 6th charactor with x in each line. abcdefghijklmn 123456789011 excepted result: abcxxxghijklmn 123xxx789011 Thanks in advance. (6 Replies)
Discussion started by: ken6503
6 Replies

3. Shell Programming and Scripting

Replace first 3 characters in a unix file in all lines

Replace first 3 characters in a unix file (say replace "A&B" with "C&D") in all lines of the file. Need a sed or awk script to do this. Kindly help! -Kumar (4 Replies)
Discussion started by: vasan2815
4 Replies

4. Shell Programming and Scripting

Using shell to replace characters in a text file

Can I just say, this is such a frustrating and yet enormously rewarding field of study. I'm in the middle of configuring GeekTool (Uh oh, stupid n00b) and I really only have one question. I'm using Automator to grab a RSS feed, having GeekTool continually run that application every 10 minutes,... (7 Replies)
Discussion started by: SomeTechGuy
7 Replies

5. Shell Programming and Scripting

Replace characters then read the file without changing it

Hi All At the moment the following code works but ideally i do not want to have to change the original $1 tr "\r" "\n" < "$1" > "$1.fix" printf "\n" >> "$1.fix" mv "$1.fix" "$1" FILE=$1 coffee_out="splitmovie" coffee_fill="-splitAt" coffee_end="-self-contained -o output.mov $2"... (1 Reply)
Discussion started by: babajuma
1 Replies

6. UNIX for Dummies Questions & Answers

Find and replace special characters in a file

HI All I need a shell script ehich removes all special characters from file and converts the file to UTF-* format Specail characters to be removed must be configurable. strIllegal = @"?/><,:;""'{|\\+=-)(*&^%$#@!~`"; Please help me in getting this script as my scripting skilla are... (2 Replies)
Discussion started by: sujithchandra
2 Replies

7. Shell Programming and Scripting

replace characters in a file

Hi, I have a file in which i want to replace the charaters from position 3-5 with a particular string for the first line. For ex The file contains abcdefghij jkdsflsfkdk 908090900 i want to replace the characters 3-5 for the first line as 678 so, the file should look like ... (7 Replies)
Discussion started by: dnat
7 Replies

8. Shell Programming and Scripting

How to replace characters 7 through 14 of every line in a file

Hi all, I have a file with multiple lines. I want to replace characters 7 through 14 of every line with 0000000 Input: 12345678901234567890 23456789012345678901 Output 12345600000004567890 23456700000005678901 Please help. JaK (9 Replies)
Discussion started by: jakSun8
9 Replies

9. UNIX for Dummies Questions & Answers

Replace Special characters in a file

Hi, I have a data like this in a file, 402003279034002000100147626030003300010000000000002000029000000 ær^M^\MÍW^H I need to replace those special char to some other char like # or $ Is there any ways to do it... I tried commands tr,sed and many but it was not able to replace because... (1 Reply)
Discussion started by: solai
1 Replies

10. Shell Programming and Scripting

Replace characters in all file names in a particular directory

Hi, I have searched the forum on how to mass replace the file names. We are doing the migration and I am trying to accomplish a task where I have to replace all UNIX scripts in a particular directory that start with bdw to fdm... For example: bdw0110137.sh should be fdm0110137.sh Keep the... (4 Replies)
Discussion started by: madhunk
4 Replies
Login or Register to Ask a Question