What is the reason for prompting bash:command not found under linux

This article introduces the relevant knowledge of "what is the reason for prompting bash:command not found under linux". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

If the newly installed system, run some very normal commands such as: shutdown,fdisk, blatantly prompt: bash:command not found. that

The first thing to consider is whether these environment variables are already included in root's $PATH.

Mainly these four: / bin,/usr/ bin,/sbin,/usr/sbin.

Four main things to store:

. / bin:

Bin is the abbreviation of binary to put some necessary execution files of the system, such as cat, cp, chmod df, dmesg, gzip, kill, ls, mkdir, more, mount, rm, su, tar and so on.

/ usr/bin:

It mainly places some essential execution files of application software tools, such as C++, Gmail +, gcc, chdrv, diff, dig, du, eject, elm, free, gnome*, gzip, htpasswd, kfm, ktop, last, less, locale, M4, make, man, mcopy, ncftp, newaliases, nslookup passwd, quota, smb*, wget and so on.

/ sbin:

It mainly places some essential programs for system management, such as cfdisk, dhcpcd, dump, e2fsck, fdisk, halt, ifconfig, ifup, ifdown, init, insmod, lilo, lsmod, mke2fs, modprobe, quotacheck, reboot, rmmod, runlevel, shutdown and so on.

/ usr/sbin:

Place some essential programs for network management, such as dhcpd, httpd, imap, in.*d, inetd, lpd, named, netconfig, nmbd, samba, sendmail, squid, swap, tcpd, tcpdump, etc.

You can view the PATH in .bash _ profile in the home directory. If it is: PATH=$PATH:$HOME/bin, it needs to be added as follows:

PATH=$PATH:$HOME/bin:/sbin:/usr/bin:/usr/sbin

After installing CentOS5.5 on the virtual machine today, I found that when I ran some normal commands such as: init,shutdown,fdisk, I flagrantly prompted:

Bash: xx command not found .

So, the first thing to consider is whether these environment variables are already included in root's $PATH (maybe I chose "minimum installation" during installation, resulting in some features not being enabled).

There are mainly these four: / bin, / usr/bin, / sbin, / usr/sbin.

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