Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Problem with pipe into sed

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Problem with pipe into sed
# 1  
Old 08-13-2005
Problem with pipe into sed
Basically I am trying to write a short script to report total space used on /u0? file systems. This is what I was trying to do:
Code:
df -k /u0? | grep -v kbytes | awk '{ printf $2 "+" }' | sed s/.$// | bc

But it returns no output.

This works however:
Code:
> A=`df -k /u0? |grep -v kbytes | awk '{ printf $2 "+" }'
> echo $A
26214400+2097152+20971520+1063256064+20971520+418381824+
> echo $A | sed s/.$//
26214400+2097152+20971520+1063256064+20971520+418381824
> echo $A | sed s/.$// | bc
1551892480

And can all of this be done in awk (eliminate the grep and sed statements)?
# 2  
Old 08-13-2005
Code:
df -k /0? | nawk '!/kbytes/{sum+=$2}END{print sum}'

# 3  
Old 08-13-2005
You are awesome, simply awesome.

Thank you very much!
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Pipe awk's output to sed for deletion

Hi Friends, I am using a command that prints certain lines from a file. For ex: cat input abc chr1 456 def chr1 789 ghi chr1 999 jjj chr1 777 jhk chr7 914 My command awk '{if($2=="chr1" && $3>=456 && $3<=999) {print $0}}' OFS="\t" input Output being printed is abc chr1 456 (7 Replies)
Discussion started by: jacobs.smith
7 Replies

2. Shell Programming and Scripting

help with sed or awk with less pipe

<tr><th align=right valign=top>Faulty_Part</th><td align=left valign=top>readhat version 6.0</td></tr> <tr><th align=right valign=top>Submit_Date</th><td align=left valign=top>2011-04-28 02:08:02</td></tr> .......(a long string) I want to get all the field between "left valign=top>" and "... (2 Replies)
Discussion started by: yanglei_fage
2 Replies

3. Shell Programming and Scripting

The problem of pipe

Hi,guys: I want to use c to implement a pipe. For example: ps auxwww | grep fred | more I forked three child processes. Each is responsible for each command, and pipe to next one. for(i=0;i<2;i++) pipe(fd) if(child==1) // child 1 { close(1) dup2(fd,1) close(fd) }... (3 Replies)
Discussion started by: tomlee
3 Replies

4. Programming

pipe() and poll() problem in C

Hi all, Im trying to do a simple program which ask the user for a unix command with the arguments. The program fork and the two process communicate with pipes. The child process call execvp with the command and the father process read the result of the execvp via the pipe. This program works... (11 Replies)
Discussion started by: blackmamba21
11 Replies

5. UNIX for Dummies Questions & Answers

problem with pipe operator

hi i am having issues with extra pipe. i have a data file and i need to remove the extra pipe in the(example 4th and 7thline) in datafile. there are many other line and filed like this which i need to remove from files. The sample data is below: 270 31|455004|24/03/2010|0001235|72 271... (3 Replies)
Discussion started by: abhi_n123
3 Replies

6. Shell Programming and Scripting

pipe output of grep to sed?

Is there a way I can do this: search for text and replace line containing matched text with a different line? For example: "I want to replace text" I want to search for replace and then change the line to I am perplexed. Hope that makes sense. Thanks in advance. (4 Replies)
Discussion started by: arsh
4 Replies

7. Shell Programming and Scripting

problem using a pipe to grep

Hello ! I want to process a text file in order to extract desired data using sed and grep... Now I am facing a problem piping to grep... nothing happens.. The text consists of blocks of 3 lines that may (or not) contain the Desired data. the desired data is on each 2... (4 Replies)
Discussion started by: ShellBeginner
4 Replies

8. Programming

Pipe problem

Could anyone tell me whats wrong whit this piping? the commands that they execute are correct. the command I am trying is ls|wc. Both processes go to the right if statement. for(i=0;i<argc;i++){ if(i==0&&argc>1){//first command if(pipe(pipa1)==-1) ... (2 Replies)
Discussion started by: isato
2 Replies

9. Programming

Problem in read() from a pipe

Hi, Can any one please help me with this. Am struggling hard to get a solution. I am doing telnet through a C program and getting the stdout file descriptor of the remote machine to pipe. read() function is getting data, But whenl it receives SOH character ie. ^A ( Start of heading = Console... (2 Replies)
Discussion started by: JDS
2 Replies

10. Programming

Pipe Problem

Is there a way to know whether is pipe is opened in read or write mode.I mean is there any signal that is generated when a pipe is opened in read or write mode. If you have some solution .please let me know ........ (2 Replies)
Discussion started by: vivivo2000
2 Replies
Login or Register to Ask a Question