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Move "-o" in grep invocation so that it doesn't look so weird

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edited Dec 5, 2022 at 9:41

This is one of the reasons why the bash manual says:

For almost every purpose, shell functions are preferred over aliases.

dockerid() {
    docker ps -a \
    | grep -o -E '^[a-z0-9]{12}' -o \
    | awk '{printf "%s ",$0} END {print ""}'
}

Although the alias quoting hell goes away by replacing awk with paste

alias dockerid="docker ps -a | grep -o -E '^[a-z0-9]{12}' -o | paste -d ' ' -s"

This is one of the reasons why the bash manual says:

For almost every purpose, shell functions are preferred over aliases.

dockerid() {
    docker ps -a \
    | grep -E '^[a-z0-9]{12}' -o \
    | awk '{printf "%s ",$0} END {print ""}'
}

Although the alias quoting hell goes away by replacing awk with paste

alias dockerid="docker ps -a | grep -E '^[a-z0-9]{12}' -o | paste -d ' ' -s"

This is one of the reasons why the bash manual says:

For almost every purpose, shell functions are preferred over aliases.

dockerid() {
    docker ps -a \
    | grep -o -E '^[a-z0-9]{12}' \
    | awk '{printf "%s ",$0} END {print ""}'
}

Although the alias quoting hell goes away by replacing awk with paste

alias dockerid="docker ps -a | grep -o -E '^[a-z0-9]{12}' | paste -d ' ' -s"

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answered Dec 2, 2022 at 20:05

This is one of the reasons why the bash manual says:

For almost every purpose, shell functions are preferred over aliases.

dockerid() {
    docker ps -a \
    | grep -E '^[a-z0-9]{12}' -o \
    | awk '{printf "%s ",$0} END {print ""}'
}

Although the alias quoting hell goes away by replacing awk with paste

alias dockerid="docker ps -a | grep -E '^[a-z0-9]{12}' -o | paste -d ' ' -s"