Hello, here is my problem:
I have 20 machines that need to SSH into 1 machine throughout the day. The issue is every time I go through the process of putting my keys from one of the computers that needs to SSH to the server that needs to accept all the incoming SSH's it overrides the last one.
... (6 Replies)
hi
I have a script to login from a host "A" to a list of hosts in a file and perform some commands inside it...its somethin like this
for i in `cat file`
do
ssh -t $i " command1 ; command2; ..."
done
I wanna save the outputs in a file in the current host "A" i.e from where I am... (3 Replies)
Hi im trying to write a script to logon to list of servers with same userID. I have no option/plan to implement ssh-keygen sharing between the systems, so i have written script creating 2 files,
file1 holds list of hosts
host1
host2
host3
file2 has following script
for i in `cat file1`... (1 Reply)
I have a script on about 15 hosts that I need to run for each host whenever I want (not crontab). Problem is, this script takes 5-10 mins to run for each host. Is there a way I can run the script in parallel for all the hosts instead of 1 at a time? Also, I'm remotely running the script on the... (3 Replies)
Hi guys - I am having a hard time trying to figure how to search for a certain string on config files hosted on multiple hosts.
This is an example:
Hostnames: myhost1.mycompany.com|myhost2.mycompany.com|myhost3.mycompany.com
String to search for: myipaddress.somehost.com
Directory... (9 Replies)
Hi All,
I have the below requirement.
I want to copy the local file to remote after that i need to run the local script on a remote machine.When i use two ssh commnds i can achieve this. But i want to achieve this using one ssh command.
Below command to copy the local file to remote
ssh -q... (2 Replies)
I created a script to check for tsm backup status on linux hosts. Script uses a source file to connect to each host and run a dsmc command on each host and write the output back to a output file located on the parent server where the script is running. The script works fine for the first 2 hosts... (4 Replies)
Dear Folks,
I am trying to read a config file contains ip and port numbers.
i want to read each line of the config file and check ssh connection is happening or not.
Kindly guide.
Config file:
abc@1.2.342 22
abc@1.2.343 22
abc@1.2.344 22
abc@1.2.345 22... (9 Replies)
Hello all,
i'm trying to create a report by greping a pattern on multiple remote hosts and creta a simple report,
actually i did this, is ther any better way to do this.
#!/bin/bash
for host in `cat RemoteHosts`
do
ssh $host -C 'hostname 2>&1; grep ERROR /var/log/WebServer.log.2019-09-21... (0 Replies)
Hi all,
i'm trying to gether multiple pattern on remote hosts, and trying to print hostname and the pattern,
ssh remoteserver1 -C 'hostname 2>&1;cat /var/log/server1.log | awk -F ";" '"'"'{ print " "$2" "$5}'"'"'| sort | uniq -c | sort -g -r '
The output is the following,
remoteserver1
... (8 Replies)
Discussion started by: charli1
8 Replies
LEARN ABOUT DEBIAN
io_tryread
io_tryread(3) Library Functions Manual io_tryread(3)NAME
io_tryread - read from a descriptor without blocking
SYNTAX
#include <io.h>
int io_tryread(int64 fd,char* buf,int64 len);
DESCRIPTION
io_tryread tries to read len bytes of data from descriptor fd into buf[0], buf[1], ..., buf[len-1]. (The effects are undefined if len is 0
or smaller.) There are several possible results:
o o_tryread returns an integer between 1 and len: This number of bytes was available for immediate reading; the bytes were read into the
beginning of buf. Note that this number can be, and often is, smaller than len; you must not assume that io_tryread always succeeds in
reading exactly len bytes.
o io_tryread returns 0: No bytes were read, because the descriptor is at end of file. For example, this descriptor has reached the end of
a disk file, or is reading an empty pipe that has been closed by all writers.
o io_tryread returns -1, setting errno to EAGAIN: No bytes were read, because the descriptor is not ready. For example, the descriptor is
reading an empty pipe that could still be written to.
o io_tryread returns -3, setting errno to something other than EAGAIN: No bytes were read, because the read attempt encountered a persis-
tent error, such as a serious disk failure (EIO), an unreachable network (ENETUNREACH), or an invalid descriptor number (EBADF).
io_tryread does not pause waiting for a descriptor that is not ready. If you want to pause, use io_waitread or io_wait.
You can make io_tryread faster and more efficient by making the socket non-blocking with io_nonblock().
SEE ALSO io_nonblock(3), io_waitread(3), io_tryreadtimeout(3)io_tryread(3)