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  • Shell script to count files, then remove oldest files

    - by Nic Hubbard
    I am new to shell scripting, so I need some help here. I have a directory that fills up with backups. If I have more than 10 backup files, I would like to remove the oldest files, so that the 10 newest backup files are the only ones that are left. So far, I know how to count the files, which seems easy enough, but how do I then remove the oldest files, if the count is over 10? if [ls /backups | wc -l > 10] then echo "More than 10" fi

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  • change shell directory from a script?

    - by ajsie
    i want to make a script (to) that makes it easier for me to enter folders. so eg. if i type "to apache" i want it to change the current directory to /etc/apache2. however, when i use the "cd" command inside the script, it seems like it changes the path WITHIN the script, so the path in the shell has not changed. how could i make this work?

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  • ubuntu 64 or 32 bit for macbook/vps?

    - by ajsie
    i've got macbook pro and wonder if i should use 64 or 32 bits ubuntu server? and then i've got a vps not hosted by med. how do i know what version to choose? how do you check how many bits your cpu i working with? can i use 64 on 32 and vice versa?

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  • Grep in XML file

    - by nishant
    I have to find some patters from a XML file, but i am unable to do it. <field> <uniqueid>account </uniqueod> <tableid>afs</tableid> </field> <field> <uniqueid>address</uniqueod> <tableid>afs</tableid> </field> what i have to do is to search the entries between these two fields and redirect them to a file.txt.and output should be such that uniqueid tableid uniqueid tableid i.e. for each uniqueid tableid should be printed along with it. The entries can be different or same. Guys help me out...

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  • TERM environment variable not set

    - by rahkarp
    I'm using python to develop an app and want to view running processes.The code txt = commands.getoutput("top -d 1") print txt gives an error "TERM Environment Variable not set" Can someone tell me what this means and how to solve this

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  • How to avoid escaping by accident in PERL using system()?

    - by Brian
    I want to run some commands using the system() command, I do this way: execute_command_error("trash-put '/home/$filename'"); Where execute_command_error will report if there was an error with whatever system command it ran. I know I could just unlink the file using Perl commands, but I want to delete stuff using trash-put as it's a type of recycling program. My problem is that $filename will sometimes have apostrophes, quotes, and other weird characters in it that mess up the system command or Perl itself.

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  • ImageMagick bash script issue

    - by gAMBOOKa
    // This works convert ${path}${dst} -crop ${crop} ${path}${dst} // but when changed to this, it fails convert ${path}${src} -trim ${path}${dst} convert ${path}${dst} -crop ${crop} ${path}"pdf_"${dst} What am I doing wrong?

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  • Simple cdd (custom debian distribution) problem

    - by Daniel G. R.
    Hi everyone, Im trying to make my own debian distribution but I have a problem. simple-cdd works fine but when I try to install my generated .iso, everything goes right since a message apears: " No installable kernel was found in the defined APT sources You may try to continue without a kernel. and manually install your kernel later. This is only recommended for experts, otheriwse you will likely end with a machine that dosent boot. COntinue Without installing a kernel? " And if y say yes, it continues... When is time to install grub it says: " Installation step failed An installation step failed. You can try to run the failing item again from the menu, or skip it and choose something else. The failing step is: Install the GRUB boot loader on a hard disk " HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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  • how to identify process in kernel read func without using current->pid

    - by yoavstr
    my lecture wants us to build module where we need to identify each read process and where the same read process called twice on the same writer massage we should insert him to an queue who's we wake up when all readers have read I achieved this goal by by using list of pid's and boolean read/not_read inside each node but he decided to be nasty and require us to it with some argument from FILE struct can you please help me ?....

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  • Why does mmap() fail with ENOMEM on a 1TB sparse file?

    - by metadaddy
    I've been working with large sparse files on openSUSE 11.2 x86_64. When I try to mmap() a 1TB sparse file, it fails with ENOMEM. I would have thought that the 64 bit address space would be adequate to map in a terabyte, but it seems not. Experimenting further, a 1GB file works fine, but a 2GB file (and anything bigger) fails. I'm guessing there might be a setting somewhere to tweak, but an extensive search turns up nothing. Here's some sample code that shows the problem - any clues? #include <errno.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/mman.h> #include <sys/types.h> #include <unistd.h> int main(int argc, char *argv[]) { char * filename = argv[1]; int fd; off_t size = 1UL << 40; // 30 == 1GB, 40 == 1TB fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, 0666); ftruncate(fd, size); printf("Created %ld byte sparse file\n", size); char * buffer = (char *)mmap(NULL, (size_t)size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if ( buffer == MAP_FAILED ) { perror("mmap"); exit(1); } printf("Done mmap - returned 0x0%lx\n", (unsigned long)buffer); strcpy( buffer, "cafebabe" ); printf("Wrote to start\n"); strcpy( buffer + (size - 9), "deadbeef" ); printf("Wrote to end\n"); if ( munmap(buffer, (size_t)size) < 0 ) { perror("munmap"); exit(1); } close(fd); return 0; }

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  • How to enable 'wget' to download the whole content of HTML with Javascript

    - by neversaint
    I have a site which I want to download using Unix wget. If you look at the source code and content of the file it contain section called SUMMARY. However after issuing a wget command like this: wget -O downdloadedtext.txt http://www.ncbi.nlm.nih.gov/IEB/Research/Acembly/av.cgi?db=mouse&c=gene&a=fiche&l=2610008E11Rik The content of the downdloadedtext.txt is incomplete and different with the source code of that site. For example it doesn't contain SUMMARY section. Is there a correct way to obtain the full content correctly? The reason I ask this because I want to automate the download from different values in that HTML.

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  • Identifying the parts of this typedef struct in C?

    - by Tommy
    Please help me identify the parts of this typdef struct and what each part does and how it can be used: typedef struct my_struct { int a; int b; int c; } struct_int, *p_s; struct_int struct_array[5]; my_struct is the...? struct_int is the...? *p_s is the...and can be used to point to what? struct_array is the...? Also, when creating the array of structs, why do we use struct_int instead of my_struct ? Thank You!

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  • Print a file skipping X lines in Bash

    - by Eduardo
    Hi I have a very long file which I want to print but skipping the first 1e6 lines for example. I look into the cat man page but I did not see nay option to do this. I am looking for a command to do this or a simple bash program. I know how to do it using a program in C but I want to do it using the common commands. Any way to do it? Thanks a lot in advance..

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  • Need a very simple bash-based webserver for logging XML in HTTP POST

    - by Syffys
    As in title, it's for testing purpose and I need it to be extremely light (1 line to 1 single light file). Here is a XML query sample: XML_QUERY=$(cat <<EOF <?xml version='1.0' encoding='UTF-8'?> <Test></Test> EOF ) curl -H "Content-type: text/xml; charset=utf-8" -H "Soapaction: \"\"" -k -d "${XML_QUERY}" http://localhost:8088 Here are some of the tracks I have found so far even if I wasnt able to adapt them to work as I expect: Netcat minimal webserver: Problem is that my nc does not have the -q option, so the connection is closing before delivering the XML content Netcat Only webserver: Same as above Python based: But does not handle POST Thanks in advance!

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  • what does '-' stand for in bash?

    - by trybeingarun
    Hi, What exactly are the uses of '-' in bash? I know they can be used for 1. cd - # to take you to the old 'present working directory' 2. some stream generating command | vim - # somehow vim gets the text. My question is what exactly is - in bash? In what other contexts can I use it? Regards Arun

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  • Why does my Perl TCP server script hang with many TCP connections?

    - by viraptor
    I've got a strange issue with a server accepting TCP connections. Even though there are normally some processes waiting, at some volume of connections it hangs. Long version: The server is written in Perl and binds a $srv socket with the reuse flag and listen == 5. Afterwards, it forks into 10 processes with a loop of $clt=$srv->accept(); do_processing($clt); $clt->shutdown(2); The client written in C is also very simple - it sends some lines, then receives all lines available and does a shutdown(sockfd, 2); There's nothing async going on and at the end both send and receive queues are empty (as reported by netstat). Connections last only ~20ms. All clients behave the same way, are the same implementation, etc. Now let's say I'm accepting X connections from client 1 and another X from client 2. Processes still report that they're idle all the time. If I add another X connections from client 3, suddenly the server processes start hanging just after accepting. The first blocking thing they do after accept(); is while (<$clt>) ... - but they don't get any data (on the first try already). Suddenly all 10 processes are in this state and do not stop waiting. On strace, the server processes seem to hang on read(), which makes sense. There are loads of connections in TIME_WAIT state belonging to that server (~100 when the problem starts to manifest), but this might be a red herring. What could be happening here?

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  • Memory Management with returning char* function

    - by RageD
    Hello all, Today, without much thought, I wrote a simple function return to a char* based on a switch statement of given enum values. This, however, made me wonder how I could release that memory. What I did was something like this: char* func() { char* retval = new char; // Switch blah blah - will always return some value other than NULL since default: return retval; } I apologize if this is a naive question, but what is the best way to release the memory seeing as I cannot delete the memory after the return and, obviously, if I delete it before, I won't have a returned value. What I was thinking as a viable solution was something like this void func(char*& in) { // blah blah switch make it do something } int main() { char* val = new char; func(val); // Do whatever with func (normally func within a data structure with specific enum set so could run multiple times to change output) val = NULL; delete val; val = NULL; return 0; } Would anyone have anymore insight on this and/or explanation on which to use? Regards, Dennis M.

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  • Howto plot two cumulative frequency graph together

    - by neversaint
    I have data that looks like this: #val Freq1 Freq2 0.000 178 202 0.001 4611 5300 0.002 99 112 0.003 26 30 0.004 17 20 0.005 15 20 0.006 11 14 0.007 11 13 0.008 13 13 ...many more lines.. Full data can be found here: http://dpaste.com/173536/plain/ What I intend to do is to have a cumulative graph with "val" as x-axis with "Freq1" & "Freq2" as y-axis, plot together in 1 graph. I have this code. But it creates two plots instead of 1. dat <- read.table("stat.txt",header=F); val<-dat$V1 freq1<-dat$V2 freq2<-dat$V3 valf1<-rep(val,freq1) valf2<-rep(val,freq2) valfreq1table<- table(valf1) valfreq2table<- table(valf2) cumfreq1=c(0,cumsum(valfreq1table)) cumfreq2=c(0,cumsum(valfreq2table)) plot(cumfreq1, ylab="CumFreq",xlab="Loglik Ratio") lines(cumfreq1) plot(cumfreq2, ylab="CumFreq",xlab="Loglik Ratio") lines(cumfreq2) What's the right way to approach this?

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  • Modify bash variables with sed

    - by Alexander Cska
    I am trying to modify a number of environmental variables containing predefined compiler flags. To do so, I tried using a bash loop that goes over all environmental variables listed with "env". for i in $(env | grep ipo | awk 'BEGIN {FS="="} ; { print $1 } ' ) do echo $(sed -e "s/-ipo/ / ; s/-axAVX/ /" <<< $i) done This is not working since the loop variable $i contains just the name of the environmental variable stored as a character string. I tried searching a method to convert a string into a variable but things started becoming unnecessary complicated. The basic problem is how to properly supply the environmental variable itself to sed. Any ideas how to properly modify my script are welcome. Thanks, Alex

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  • Run FFmpeg from Shell Script

    - by Abs
    Hello all, I have found a useful shell script that shows all files in a directory recursively. Where it prints the file name echo "$i"; #Display File name. I would instead like to run an ffmpeg command on non MP3 files, how can I do this? I have very limited knowledge of shell scripts so I appreciate if I was spoon fed! :) //if file is NOT MP3 ffmpeg -i [the_file] -sameq [same_file_name_with_mp3_extension] //delete old file Here is the shell script for reference. DIR="." function list_files() { if !(test -d "$1") then echo $1; return; fi cd "$1" echo; echo `pwd`:; #Display Directory name for i in * do if test -d "$i" #if dictionary then list_files "$i" #recursively list files cd .. else echo "$i"; #Display File name fi done } if [ $# -eq 0 ] then list_files . exit 0 fi for i in $* do DIR="$1" list_files "$DIR" shift 1 #To read next directory/file name done

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