Open file settings linux

How do I change the number of open files limit in Linux? [closed]

When running my application I sometimes get an error about too many files open . Running ulimit -a reports that the limit is 1024. How do I increase the limit above 1024? Edit ulimit -n 2048 results in a permission error.

I just went through this on Centos 7 (same on RHEL) and made a blog post covering it because I had so much trouble even with all these posts: coding-stream-of-consciousness.com/2018/12/21/…. Often along with open files, you need to increase nproc which actually resides in multiple settings files. and if you use systemd/systemctl that has its own separate settings. It’s kind of nuts.

4 Answers 4

You could always try doing a ulimit -n 2048 . This will only reset the limit for your current shell and the number you specify must not exceed the hard limit

Each operating system has a different hard limit setup in a configuration file. For instance, the hard open file limit on Solaris can be set on boot from /etc/system.

set rlim_fd_max = 166384 set rlim_fd_cur = 8192 

On OS X, this same data must be set in /etc/sysctl.conf.

kern.maxfilesperproc=166384 kern.maxfiles=8192 

Under Linux, these settings are often in /etc/security/limits.conf.

There are two kinds of limits:

• soft limits are simply the currently enforced limits
• hard limits mark the maximum value which cannot be exceeded by setting a soft limit

Soft limits could be set by any user while hard limits are changeable only by root. Limits are a property of a process. They are inherited when a child process is created so system-wide limits should be set during the system initialization in init scripts and user limits should be set during user login for example by using pam_limits.

There are often defaults set when the machine boots. So, even though you may reset your ulimit in an individual shell, you may find that it resets back to the previous value on reboot. You may want to grep your boot scripts for the existence ulimit commands if you want to change the default.

Источник

How to display file properties via terminal?

What is the command line that displays file informations (or properties), such as in GUI method Display properties in GNOME? I know that ls -l shows properties; but how to display the same informations? For example, instead of

abdennour@estifeda: $wishedCmd myFile . Permissions : Owner Access: Read & write Group Access :Read & Write Others Access: Read only . 

What about stat ? That will give you a huge amount of information on a selected file or folder; see man stat .

10 Answers 10

Use the stat command to know the details of the file. If file name is file_name , use

There is no dedicated command for this. For meta information like time, size and access rights, use

You might also be interested in what kind of file it is, file path-to-file will help you with that.

#!/bin/bash print_perm() < case "$1" in 0) printf "NO PERMISSIONS";; 1) printf "Execute only";; 2) printf "Write only";; 3) printf "Write & execute";; 4) printf "Read only";; 5) printf "Read & execute";; 6) printf "Read & write";; 7) printf "Read & write & execute";; esac >[[ ! -e $1 ]] && echo "$0 " 2>&1 && exit 1 perm=$(stat -c%a "$1") user=$ group=$ global=$ echo "Permissions :" printf "\tOwner Access: $(print_perm $user)\n" printf "\tGroup Access: $(print_perm $group)\n" printf "\tOthers Access: $(print_perm $global)\n" 

# rwxr-x--- foo* > ./abovescript foo Permissions : Owner Access: Read & write & execute Group Access: Read & execute Others Access: NO PERMISSIONS 

for human readable version

This makes the filesize «readable». You get 32K instead of 31900. But does not help for access rights. But helpful anyway 😉

Display the attributes of the files in the current directory:

List the attributes of files in a particular path:

List file attributes recursively in the current and subsequent directories:

Show attributes of all the files in the current directory, including hidden ones:

Display attributes of directories in the current directory:

In Terminal you can use : « objdump -f file.exe « you’II see file format output like this : ` « file.exe: file format pei-i386 architecture: i386, flags 0x0000. EXEC_P, HAS_DEBUG, D_PAGED start address 0x00402. « So file format pei-i386 => 32bit Other method to check out what format the executable file has. using ` file ` command as example: « $ file myfile.exe « response > myfile.exe: PE32 executable (GUI) Intel 80386, for MS Windows «`

I tried the objdump way first and got «file format not recognized» then when I used the file command got «POSIX shell script, ASCII text executable, with very long lines»

Источник