Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Replace strings based on position and length?

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Replace strings based on position and length?
# 1  
Old 06-03-2010
Replace strings based on position and length?
Suppose i have a file which contains thousands of records. e.g adjgmptjadmwpgjmwmd i need to replace the string from 3rd to 8th position using awk script in entire file. And also the positions will be passed as parameter.
# 2  
Old 06-03-2010
awk supports a substr(var,x,y) function...to which you could variable-ize the x and y, but are you intending a wholesale replacement of these columns, or more of a pattern-based replacement?
# 3  
Old 06-03-2010
Or use sed, e.g.
Code:
sed "s/^\(..\)....../\1$var/" infile

Example:
Code:
$ var=abcdef
$ echo 123456789|sed "s/^\(..\)....../\1$var/"
12abcdef9

# 4  
Old 06-04-2010
awk -v a=0 -v b=8 '{print substr($0,0,a)"."substr($0,b)}'

im trying like this replace a string based on position
"unix" instead of "." and i need to pass unix as parameter.
how to pass it?

---------- Post updated at 05:46 PM ---------- Previous update was at 04:29 PM ----------

can anyone pls suggest?
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Print strings from a particular position in each line

I am using bash in Fedora 30 From the below lines (ls -l output), how can I print whatever is between the strings 'status_' and '.log' $ ls -l | grep -i status -rw-rw-r--. 1 sysadmin sysadmin 378530 Nov 11 21:58 status_vsbm1.log -rw-rw-r--. 1 sysadmin sysadmin 428776 Nov 11 21:58... (8 Replies)
Discussion started by: kraljic
8 Replies

2. Shell Programming and Scripting

Search for a string at a particular position and replace with blank based on position

Hi, I have a file with multiple lines(fixed width dat file). I want to search for '02' in the positions 45-46 and if available, in that lines, I need to replace value in position 359 with blank. As I am new to unix, I am not able to figure out how to do this. Can you please help me to achieve... (9 Replies)
Discussion started by: Pradhikshan
9 Replies

3. UNIX for Dummies Questions & Answers

Help with awk, where line length and field position are variable

I have several questions about using awk. I'm hoping someone could lend me a hand. (I'm also hoping that my questions make sense.) I have a file that contains pipe separated data. Each line has similar data but the number of fields and the field position on each line is variable. ... (3 Replies)
Discussion started by: Cheese64
3 Replies

4. Shell Programming and Scripting

Extract substring specif position and length from file line

Hi gurus, I am trying to figure out how to extract substring from file line (all lines in file), as specified position and specified legth. Example input (file lines) dhaskjdsa dsadhkjsa dhsakjdsad hsadkjh dsahjdksahdsad sahkjd sahdkjsahd sajkdh adhjsak I want to extract substring on... (5 Replies)
Discussion started by: ProsteJa
5 Replies

5. Shell Programming and Scripting

sed or awk command to replace a string pattern with another string based on position of this string

here is what i want to achieve... consider a file contains below contents. the file size is large about 60mb cat dump.sql INSERT INTO `table1` (`id`, `action`, `date`, `descrip`, `lastModified`) VALUES (1,'Change','2011-05-05 00:00:00','Account Updated','2012-02-10... (10 Replies)
Discussion started by: vivek d r
10 Replies

6. UNIX for Dummies Questions & Answers

Delete strings in file1 based on the list of strings in file2

Hello guys, should be a very easy questn for you: I need to delete strings in file1 based on the list of strings in file2. like file2: word1_word2_ word3_word5_ word3_word4_ word6_word7_ file1: word1_word2_otherwords..,word3_word5_others... (7 Replies)
Discussion started by: roussine
7 Replies

7. UNIX for Dummies Questions & Answers

Replace based on an exact position

Trying to use sed - but having no luck. I have a text file - I want to replace whatever character is in position 106, 157 and 237 w/ the string "xxx". Want this change for all lines w/in that text file. I'm open to using awk or whatever command would be best for replacing characters based... (5 Replies)
Discussion started by: svn
5 Replies

8. Shell Programming and Scripting

Split strings based on length

Hi All I am very much in need of help splitting strings based on length in Perl. e.g., Input text is : International NOUN Corp. NOUN 's POS Tulsa NOUN Output I want is : International I In Int Inte l al nal onal NOUN Corp. C Co Cor Corp . p. rp. orp. NOUN... (2 Replies)
Discussion started by: my_Perl
2 Replies

9. Shell Programming and Scripting

awk - replace number of string length from search and replace for a serialized array

Hello, I really would appreciate some help with a bash script for some string manipulation on an SQL dump: I'd like to be able to rename "sites/WHATEVER/files" to "sites/SOMETHINGELSE/files" within the sql dump. This is quite easy with sed: sed -e... (1 Reply)
Discussion started by: otrotipo
1 Replies

10. Shell Programming and Scripting

How to insert strings at certain position

Hi, I need to insert strings "0000 00" at the each line within the file. The postion is 37 to 42. ex. name1 name2 0000 00 nam name 0000 00 The "0000 00" in two lines should be lined up. I don't know why it's not lined up when I posted it. Can anyone help? (14 Replies)
Discussion started by: whatisthis
14 Replies
Login or Register to Ask a Question