total 4936
-rwxr-xr-x 1 root root 1168776 Apr 18  2019 bash
-rwxr-xr-x 1 root root   43744 Feb 28  2019 cat
-rwxr-xr-x 1 root root   64320 Feb 28  2019 chgrp
-rwxr-xr-x 1 root root   64288 Feb 28  2019 chmod
-rwxr-xr-x 1 root root   72512 Feb 28  2019 chown
-rwxr-xr-x 1 root root  146880 Feb 28  2019 cp
-rwxr-xr-x 1 root root  121464 Jan 17  2019 dash
-rwxr-xr-x 1 root root  109408 Feb 28  2019 date
-rwxr-xr-x 1 root root   76712 Feb 28  2019 dd
-rwxr-xr-x 1 root root   93744 Feb 28  2019 df
-rwxr-xr-x 1 root root  138856 Feb 28  2019 dir
-rwxr-xr-x 1 root root   84288 Jan 10  2019 dmesg
lrwxrwxrwx 1 root root       8 Sep 27  2018 dnsdomainname -> hostname
lrwxrwxrwx 1 root root       8 Sep 27  2018 domainname -> hostname
-rwxr-xr-x 1 root root   39520 Feb 28  2019 echo
-rwxr-xr-x 1 root root      28 Jan  7  2019 egrep
-rwxr-xr-x 1 root root   35424 Feb 28  2019 false
-rwxr-xr-x 1 root root      28 Jan  7  2019 fgrep
-rwxr-xr-x 1 root root   68880 Jan 10  2019 findmnt
-rwxr-xr-x 1 root root  198976 Jan  7  2019 grep
-rwxr-xr-x 2 root root    2345 Jan  5  2019 gunzip
-rwxr-xr-x 1 root root    6375 Jan  5  2019 gzexe
-rwxr-xr-x 1 root root   98048 Jan  5  2019 gzip
-rwxr-xr-x 1 root root   26696 Sep 27  2018 hostname
-rwxr-xr-x 1 root root   68552 Feb 28  2019 ln
-rwxr-xr-x 1 root root   56760 Jul 27  2018 login
-rwxr-xr-x 1 root root  138856 Feb 28  2019 ls
-rwxr-xr-x 1 root root  108624 Jan 10  2019 lsblk
-rwxr-xr-x 1 root root   89088 Feb 28  2019 mkdir
-rwxr-xr-x 1 root root   68544 Feb 28  2019 mknod
-rwxr-xr-x 1 root root   43808 Feb 28  2019 mktemp
-rwxr-xr-x 1 root root   43008 Jan 10  2019 more
-rwsr-xr-x 1 root root   51280 Jan 10  2019 mount
-rwxr-xr-x 1 root root   14408 Jan 10  2019 mountpoint
-rwxr-xr-x 1 root root  138728 Feb 28  2019 mv
lrwxrwxrwx 1 root root       8 Sep 27  2018 nisdomainname -> hostname
lrwxrwxrwx 1 root root      14 Feb 14  2019 pidof -> /sbin/killall5
-rwxr-xr-x 1 root root   39616 Feb 28  2019 pwd
lrwxrwxrwx 1 root root       4 Apr 18  2019 rbash -> bash
-rwxr-xr-x 1 root root   47776 Feb 28  2019 readlink
-rwxr-xr-x 1 root root   68416 Feb 28  2019 rm
-rwxr-xr-x 1 root root   47776 Feb 28  2019 rmdir
-rwxr-xr-x 1 root root   23312 Jan 21  2019 run-parts
-rwxr-xr-x 1 root root  122224 Dec 22  2018 sed
lrwxrwxrwx 1 root root       4 Jan 30 00:00 sh -> dash
-rwxr-xr-x 1 root root   39552 Feb 28  2019 sleep
-rwxr-xr-x 1 root root   80672 Feb 28  2019 stty
-rwsr-xr-x 1 root root   63568 Jan 10  2019 su
-rwxr-xr-x 1 root root   35488 Feb 28  2019 sync
-rwxr-xr-x 1 root root  445560 Apr 23  2019 tar
-rwxr-xr-x 1 root root   14440 Jan 21  2019 tempfile
-rwxr-xr-x 1 root root   97152 Feb 28  2019 touch
-rwxr-xr-x 1 root root   35424 Feb 28  2019 true
-rwsr-xr-x 1 root root   34888 Jan 10  2019 umount
-rwxr-xr-x 1 root root   39584 Feb 28  2019 uname
-rwxr-xr-x 2 root root    2345 Jan  5  2019 uncompress
-rwxr-xr-x 1 root root  138856 Feb 28  2019 vdir
-rwxr-xr-x 1 root root   34896 Jan 10  2019 wdctl
-rwxr-xr-x 1 root root     946 Jan 21  2019 which
lrwxrwxrwx 1 root root       8 Sep 27  2018 ypdomainname -> hostname
-rwxr-xr-x 1 root root    1983 Jan  5  2019 zcat
-rwxr-xr-x 1 root root    1677 Jan  5  2019 zcmp
-rwxr-xr-x 1 root root    5879 Jan  5  2019 zdiff
-rwxr-xr-x 1 root root      29 Jan  5  2019 zegrep
-rwxr-xr-x 1 root root      29 Jan  5  2019 zfgrep
-rwxr-xr-x 1 root root    2080 Jan  5  2019 zforce
-rwxr-xr-x 1 root root    7584 Jan  5  2019 zgrep
-rwxr-xr-x 1 root root    2205 Jan  5  2019 zless
-rwxr-xr-x 1 root root    1841 Jan  5  2019 zmore
-rwxr-xr-x 1 root root    4552 Jan  5  2019 znew

что происходит

which awk

/usr/bin/awk

Ну это норма

ls -l /usr/bin/awk

lrwxrwxrwx 1 root root 21 Jan 30 00:00 /usr/bin/awk -> /etc/alternatives/awk

ls -l /etc/alternatives/awk

lrwxrwxrwx 1 root root 13 Jan 30 00:00 /etc/alternatives/awk -> /usr/bin/mawk

Если не умеешь работать с вводом выводом - норма.

ls -l /usr/bin/mawk

-rwxr-xr-x 1 root root 121976 Mar 23  2012 /usr/bin/mawk

apt-get install coreutils

Reading package lists...
Building dependency tree...
Reading state information...
coreutils is already the newest version (8.30-3).
coreutils set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.

apt-get install gawk

Reading package lists...
Building dependency tree...
Reading state information...
The following additional packages will be installed:
 libmpfr6 libsigsegv2
Suggested packages:
 gawk-doc
The following NEW packages will be installed:
 gawk libmpfr6 libsigsegv2
0 upgraded, 3 newly installed, 0 to remove and 9 not upgraded.
Need to get 1,468 kB of archives.
After this operation, 3,655 kB of additional disk space will be used.
Do you want to continue? [Y/n] Abort.

apt-get -y install gawk

Reading package lists...
Building dependency tree...
Reading state information...
The following additional packages will be installed:
 libmpfr6 libsigsegv2
Suggested packages:
 gawk-doc
The following NEW packages will be installed:
 gawk libmpfr6 libsigsegv2
0 upgraded, 3 newly installed, 0 to remove and 9 not upgraded.
Need to get 1,468 kB of archives.
After this operation, 3,655 kB of additional disk space will be used.
Get:1 http://deb.debian.org/debian buster/main amd64 libmpfr6 amd64 4.0.2-1 [775 kB]
Get:2 http://deb.debian.org/debian buster/main amd64 libsigsegv2 amd64 2.12-2 [32.8 kB]
Get:3 http://deb.debian.org/debian buster/main amd64 gawk amd64 1:4.2.1+dfsg-1 [660 kB]
Fetched 1,468 kB in 0s (14.4 MB/s)
Selecting previously unselected package libmpfr6:amd64.
(Reading database ... (Reading database ... 5%(Reading database ... 10%(Reading database ... 15%(Reading database ... 20%(Reading database ... 25%(Reading database ... 30%(Reading database ... 35%(Reading database ... 40%(Reading database ... 45%(Reading database ... 50%(Reading database ... 55%(Reading database ... 60%(Reading database ... 65%(Reading database ... 70%(Reading database ... 75%(Reading database ... 80%(Reading database ... 85%(Reading database ... 90%(Reading database ... 95%(Reading database ... 100%(Reading database ... 7481 files and directories currently installed.)
Preparing to unpack .../libmpfr6_4.0.2-1_amd64.deb ...
Unpacking libmpfr6:amd64 (4.0.2-1) ...
Selecting previously unselected package libsigsegv2:amd64.
Preparing to unpack .../libsigsegv2_2.12-2_amd64.deb ...
Unpacking libsigsegv2:amd64 (2.12-2) ...
Setting up libmpfr6:amd64 (4.0.2-1) ...
Setting up libsigsegv2:amd64 (2.12-2) ...
Selecting previously unselected package gawk.
(Reading database ... (Reading database ... 5%(Reading database ... 10%(Reading database ... 15%(Reading database ... 20%(Reading database ... 25%(Reading database ... 30%(Reading database ... 35%(Reading database ... 40%(Reading database ... 45%(Reading database ... 50%(Reading database ... 55%(Reading database ... 60%(Reading database ... 65%(Reading database ... 70%(Reading database ... 75%(Reading database ... 80%(Reading database ... 85%(Reading database ... 90%(Reading database ... 95%(Reading database ... 100%(Reading database ... 7501 files and directories currently installed.)
Preparing to unpack .../gawk_1%3a4.2.1+dfsg-1_amd64.deb ...
Unpacking gawk (1:4.2.1+dfsg-1) ...
Setting up gawk (1:4.2.1+dfsg-1) ...
Processing triggers for libc-bin (2.28-10) ...

awk '{print tolower($0)}'

тест
test