Echo Write Error Bad File Descriptor
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4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Bash Script File Descriptor echo up vote 2 down vote favorite echo: write error: Bad file descriptor Throughout
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my code (through several bash scripts) I encounter this error. It happens when I'm trying to write or append to a (one) file. LOGRUN_SOM_MUT_ANA=/Volumes/.../logRUN_SOMATIC_MUT_ANA I use the absolute path for this variable and I use the same file for each script that is called. The file has a bunch of lines just like this. I use the import '.' on each script to get it. echo "debug level set for $DEBUG_LEVEL" >> bad file descriptor error in c ${LOGRUN_SOM_MUT_ANA} Worth noting: It typically happens AFTER the FIRST time I write to it. I read about files 'closing' themselves and yielding this error I am using the above line in one script, and then calling another script. I'd be happy to clarify anything. bash shell sh file-descriptor share|improve this question edited Dec 12 '12 at 21:38 asked Dec 12 '12 at 20:53 Phil Colson 4617 2 could you post more code? how do you define $LOGRUN_SOM_MUT_ANA? –user1006989 Dec 12 '12 at 21:12 1 and is there any chance that the value of LOGRUN_SOM_MUT_ANA is changing to something with a space in it? Good luck. –shellter Dec 12 '12 at 21:25 Why would a space do anything? What would that do? –Phil Colson Dec 12 '12 at 21:39 1 Can you give us the full value of LOGRUN_SOM_MUT_ANA? Also, try echoing the value of LOGRUN_SOM_MUT_ANA before each of your redirected echo statements appending to the file just to be sure that you are in fact appending to the file you expect in all cases. –Mark A. Fitzgerald Dec 12 '12 at 21:47 3 Please don't post pictures of your code here; it makes things much harder to work with (and less searchable, and less accessible). It's very easy to
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site python socket error bad file descriptor About Us Learn more about Stack Overflow the company Business Learn more about launchctl start error bad file descriptor hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss bad file descriptor bash script Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C: `write error: Bad http://stackoverflow.com/questions/13848431/bash-script-file-descriptor-echo file descriptor` after fork, dup2, and execv up vote 0 down vote favorite Continuing on this problem, but I'll reiterate: For a homework assignment I have to write a basic shell including redirection. The program uses readline to prompt for input, parses the input string, and breaks it down into the executable name, the arguments, and the input/output file(s), if applicable. After parsing the string, http://stackoverflow.com/questions/5268733/c-write-error-bad-file-descriptor-after-fork-dup2-and-execv it forks and the child execv()'s to the executable that was passed in. I'm using dup2() to change the file descriptors after the fork and before the execv, but am having a problem once the program has execv'd to the new executable. If in my shell I run ls > foo.out, I get: ls: write error: Bad file descriptor Here is the code for my child process (this is after fork()): int _child(struct command *c){ int ret; /* When given `ls > foo.out`, these next two lines output: ** c->infile is (null) ** c->outfile is foo.out */ printf("c->infile is %s\n",c->infile); printf("c->outfile is %s\n",c->outfile); if(c->infile){ int fd = open( c->infile, O_RDONLY); int _fd_dup = dup2(fd,0); close(0); if(_fd_dup != 0){ fprintf(stderr, "Failed to redirect command input.\n"); return 0; } } if(c->outfile){ int fd = open( c->outfile, O_WRONLY | O_CREAT | O_TRUNC, 0600); int _fd_dup = dup2(fd,1); close(1); if(_fd_dup != 1){ fprintf(stderr, "Failed to redirect command output.\n"); return 0; } } I do not get the "Failed to redirect command output." error. As I mentioned, this is a homework assignment so I'm not looking for anyone to fix this, but rather point me in the rig
Sign in Pricing Blog Support Search GitHub This https://github.com/linux-china/jenv/issues/39 repository Watch 59 Star 382 Fork 57 linux-china/jenv Code Issues 19 Pull requests 0 Projects 0 Wiki Pulse Graphs New issue echo: write http://www.catonmat.net/blog/bash-redirections-cheat-sheet/ error: Bad file descriptor #39 Open aantono opened this Issue Oct 14, 2015 · 0 comments Projects None yet Labels None bad file yet Milestone No milestone Assignees No one assigned 1 participant aantono commented Oct 14, 2015 When using jenvrc and running gradlew from inside the directory, getting the following error messages printed out to the console: /home/
fourth book! Be faster than Larry Wall at command line! Follow me on Twitter for my latest adventures! Cheat Sheets 8 Comments September 10, 2012 Bash Redirections Cheat Sheet Hey guys! A few weeks ago I wrote an article called All About Bash Redirections. It explains all the possible bash redirections with illustrations. I thought it would be a great idea to make a cheat sheet that summarizes all these redirections. So I did. Here is the bash redirections cheat sheet: Download PDF | Download PNG | Download TXT | Download TEX If you want to learn how each one of these redirections work, read my article All About Bash Redirections! Found a mistake or want to contribute to this cheat sheet? Fork it on github! Enjoy! PS. I've created a dozen different cheat sheets. Take a look at my other cheat sheets about awk, ed, sed, perl, screen, more bash, gnu coreutils, util-linux, and many others. Tweet Tags: append, bash, cheat sheet, here document, here-string, pipe, pipestatus, redirect, redirections, stderr, stdin, stdout, subshell, tcp, tee, udp 8 Comments 129,853 Views Short URL Related Posts Bash One-Liners Explained, Part III: All about redirections TCP Port Scanner in Bash How to save read-only files in vim All these bash redirections are equal TCP Traceroute Bash Emacs Editing Mode Cheat Sheet Working Productively in Bash's Vi Command Line Editing Mode (with Cheat Sheet) The Definitive Guide to Bash Command Line History Monthly Catonmat Geek T-Shirt #2: a.pipe(b).pipe(a) Traffic Accounting with Linux IPTables Comments Dave Permalink September 10, 2012, 18:15 You missed a couple: Turn off input output (throw in to the background for fun too): >&- <&- 2>&- & Reply to this comment lava Permalink September 11, 2012, 12:44 Warning: closing descriptors could cause some apps to fail, so be aware. +----------------------------------------------- |$ exec >&- |-bash: echo: write error: Bad file descriptor |-bash: echo: write error: Bad file descriptor |$ ls |ls: write error: Bad file descriptor |-bash: echo: write error: Bad file descriptor |$ echo $? >&2 |2 |-bash: echo