BusyBoxを使ってみる

万能コマンドと名高いBusyBox。
導入方法と最低限の使い方を確認しておく。

公式サイトのFAQを参考に、まずはダウンロード。

$ wget https://busybox.net/downloads/binaries/1.35.0-x86_64-linux-musl/busybox
--2024-03-06 22:36:36--  https://busybox.net/downloads/binaries/1.35.0-x86_64-linux-musl/busybox
Resolving busybox.net (busybox.net)... 140.211.167.122
Connecting to busybox.net (busybox.net)|140.211.167.122|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1131168 (1.1M)
Saving to: ‘busybox’

busybox                                     100%[===========================================================================================>]   1.08M   552KB/s    in 2.0s    

2024-03-06 22:36:49 (552 KB/s) - ‘busybox’ saved [1131168/1131168]

$ 

実行権限を付与。

$ chmod 755 busybox

lsコマンド。

$ ./busybox ls /var
account   cache     empty     games     lib       lock      mail      opt       run       tmp
adm       db        ftp       kerberos  local     log       nis       preserve  spool     yp
$ 

catとhead。
もちろんパイプでコマンドを繋ぐことも可能

$ ./busybox cat /etc/logrotate.conf | ./busybox head
# see "man logrotate" for details

# global options do not affect preceding include directives

# rotate log files weekly
weekly

# keep 4 weeks worth of backlogs
rotate 4

$ 

概ね<PATH>/busybox <COMMAND>の要領で使えば良いと理解した。