heredoc: Passing multiple lines of string

Use heredoc to pass the string as-is between two delimiters (e.g. EOF)

cat << "EOF" >> ~/.xprofile
# ~/.xprofile
export GTK_IM_MODULE=ibus
export QT_IM_MODULE=ibus
export XMODIFIERS=@im=ibus
ibus-daemon -drx
EOF

Will append the following lines in ~/.xprofile:

.xprofile

export GTK_IM_MODULE=ibus
export QT_IM_MODULE=ibus
export XMODIFIERS=@im=ibus
ibus-daemon -drx

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