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このsedコマンドは何をしますか？

tag-icon • tag-icon sed
このsedコマンドは何をしますか？ 
sed -i "s/\bforceencrypt=/encryptable=/g;s/\bforcefdeorfbe=/encryptable=/g;s/\b,encryptable=footer//" "$fstab"

しばらくAndroidで暗号化を無効にするためにこのコマンドを復号化しようとしましたが、わかりません。

答え1

情報sedから：

's/REGEXP/REPLACEMENT/[FLAGS]'
     (substitute) Match the regular-expression against the content of
     the pattern space.  If found, replace matched string with
     REPLACEMENT.

 The 's' command can be followed by zero or more of the following
FLAGS:

'g'
     Apply the replacement to _all_ matches to the REGEXP, not just the
     first.

'NUMBER'
     Only replace the NUMBERth match of the REGEXP.
...................................................................

Command Line Options: 
'-i[SUFFIX]'
'--in-place[=SUFFIX]'
     This option specifies that files are to be edited in-place.  GNU
     'sed' does this by creating a temporary file and sending output to
     this file rather than to the standard output.(1).

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