1. UNIX for Dummies Questions & Answers

Hello All, I just wanted to know what are the different ways of using commands in combination. The most common one which i know is using pipes. Also grouping is also done like ( ls; date) where output of both the commands is displayed. Are there any other ways of combining various... (2 Replies)

2. Shell Programming and Scripting

Hi, I have this following script below. Its searching a log file for 2 string and if found then write the strings to success.txt and If not found write strings to failed.txt . if one found and not other...then write found to success.txt and not found to failed.txt. I want to optimize this... (3 Replies)

3. UNIX for Dummies Questions & Answers

I want to show a output like this Lee Ballancore PID TTY TIME CMD 31799 pts/3 00:00:00 vim 31866 pts/3 00:00:00 vim 2495 pts/7 00:00:00 vim 8368 pts/0 00:00:00 vim 9544 pts/2 00:00:00 ps Alistairr Rutherford PID TTY TIME CMD 8368 pts/0 00:00:00 vim 9544 pts/2 00:00:00 ps ... (3 Replies)

4. Shell Programming and Scripting

can we optimize this command ? sed 's#AAAA##g' /study/i.txt | sed '1,2d' | tr -d '\n\' > /study/i1.txt; as here i am using two files ...its overhead..can we optimise to use only 1 file sed 's#AAAA##g' /study/i.txt | sed '1,2d' | tr -d '\n\' > /study/i.txt; keeping them same but it... (9 Replies)

5. Shell Programming and Scripting

Hi, I am cutting data from a fixed length test file and then writing out a new record using the echo command, the problem I have is how to stop multiple spaces from being written to the output file as a single space. Example: cat filea | while read line do field1=`echo $line | cut -c1-2` ... (6 Replies)

6. Shell Programming and Scripting

Hi, I have to assign a value for a varaiable based on a Input. I have written the below code: if then nf=65 elif then nf=46 elif then nf=164 elif then nf=545 elif then nf=56 elif then (3 Replies)

7. Shell Programming and Scripting

Hi guys, I feel a bit comfortable now doing bash scripting but I am worried that the way I do it is not optimized and I can do much better as to how I code. e.g. I have a whole line in a file from which I want to extract some values. Right now what I am doing is : STATE=`cat... (5 Replies)

8. Shell Programming and Scripting

Hi All, I have written a new script to check for DB space and size of dump log file before it can be imported into a Oracle DB. I'm relatively new to shell scripting. Please help me optimize this script further. (0 Replies)

9. UNIX for Beginners Questions & Answers

Hi All, I have 2 pipe delimited files viz., file_old and file_new. I'm trying to compare these 2 files, and extract all the different rows between them into a new_file. comm -3 < sort file_old < sort file_new > new_file I am getting the below error: -ksh: sort: cannot open But if I do... (7 Replies)

10. Shell Programming and Scripting

Two numerical lines, found by either header line, need to be added and the total placed in a new-header section. Also the total should should be rounded or cut to a two decimal anynumber.XX format with the AB string added on the end. For example: The numerical lines from headers 2 and 3 are... (3 Replies)