1. UNIX for Dummies Questions & Answers

Hi all, I know the one liner to delete all the lines in a file which matches a pattern i.e perl -i.old -ne 'print unless /pattern/' file Now i need the perl onliner to delete all the lines which doesnt match the pattern. Also what is the difference between perl -i and perl -i.old. Does... (1 Reply)

2. Shell Programming and Scripting

hello experts, I need a sed command that remove last 10 characters of a line start from 3rd line. any suggestions? Thanks you (7 Replies)

3. Shell Programming and Scripting

Dear All, I am looking for an option in perl using which i could delete empty lines in a file. Or the alternative of sed '/^$/d' <filename> in perl. Sed is not working in my perl script :( Pls help me out . Thanks, VG (4 Replies)

4. Shell Programming and Scripting

I have a file with varying record length in it. I need to reformat this file so that each line will have a length of 100 characters (99 characters + the line feed). AU * A01 EXPENSE 6990370000 CWF SUBC TRAVEL & MISC MY * A02 RESALE 6990788000 Y... (3 Replies)

5. UNIX for Dummies Questions & Answers

to delete the duplicate characters in a file I used this code cat file.txt|tr -s "" tell the other ways using sed command to count of duplicate characters thanks:) (0 Replies)

6. UNIX for Dummies Questions & Answers

How can I specify special meaning characters like ^ or $ inside a regex range. e.g Suppose I want to search for a string that either starts with '|' character or begins with start-of-line character. I tried the following but it does not work: sed 's/\(\)/<do something here>/g' file1 ... (3 Replies)

7. UNIX for Dummies Questions & Answers

I want to delete all the blank lines from a file before a certain line number. e.g. Input file (n: denotes line number) 1: a 2: 3: b 4: c 5: 6: d I want to delete all blank lines before line number 3, such that my output is: a b c d I see that sed '/^$/d' in_file works... (9 Replies)

8. Shell Programming and Scripting

hi Gurus, I need separate a file which is one huge line to multiple lines based on certain number of charactors. for example: abcdefghi high abaddffdd I want to separate the line to multiple lines for every 4 charactors. the result should be abcd efgh i hi gh a badd ffdd Thanks in... (5 Replies)

9. Shell Programming and Scripting

I have a test file with the following format, It contains the username_date when the user was locked from the database. $ cat lockedusers.txt TEST1_21062016 TEST2_02122015 TEST3_01032016 TEST4_01042016 I'm writing a ksh script and faced with this difficult scenario for my... (11 Replies)

10. Shell Programming and Scripting

here's what im trying to do. i have a file containing lines similar to this: data.txt: 1hsRmRsbHRiSFZNTTA1dlEyMWFkbU5wUW5CSlIyeDFTVU5SYjJOSFRuWmpia0ZuWXpKV2FHTnRU 1lKUnpWMldrZFZaMG95V25oYQpSelEyWTBka2QyRklhSHBrUjA1b1kwUkJkd3BOVXpWM1lVaG5k... (5 Replies)