Bash alias with piping

aliasbash

I'm not exactly sure what I'm doing wrong with this one. I'm trying to run the command

alias localip='ip -4 -o addr show eth0 | egrep -o '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}' | head -n 1'

If I run the command

ip -4 -o addr show eth0 | egrep -o '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}' | head -n 1

I get the result I expect, however, when trying to create an alias with the command, I get

-bash: syntax error near unexpected token `('

Any help would be appreciated. TIA.

Best Answer

You're nesting single quotes within single quotes. That doesn't work.

Try using "double quotes" in the inner expression.

`bash: syntax error near unexpected token '('`

You need to escape the brackets:

mv hiscore\(pre_mame0133u1\).dat /mnt/three/usr/local/share/xmame/hiscore.dat

Note:

For future reference you can use ShellCheck to find bugs in your bash code. Entering the uncorrected script gives the following:

$ shellcheck myscript

Line 1:
mv hiscore(pre_mame0133u1).dat /mnt/three/usr/local/share/xmame/hiscore.dat
^-- SC2148: Tips depend on target shell and yours is unknown. Add a shebang.
          ^-- SC1036: '(' is invalid here. Did you forget to escape it?
          ^-- SC1088: Parsing stopped here. Invalid use of parentheses?

Correcting the first error:

$ shellcheck myscript

Line 1:
mv hiscore\(pre_mame0133u1).dat /mnt/three/usr/local/share/xmame/hiscore.dat
^-- SC2148: Tips depend on target shell and yours is unknown. Add a shebang.
                          ^-- SC1089: Parsing stopped here. Is this keyword correctly matched up?

And correcting the second error:

$ shellcheck myscript

Line 1:
mv hiscore\(pre_mame0133u1\).dat /mnt/three/usr/local/share/xmame/hiscore.dat
^-- SC2148: Tips depend on target shell and yours is unknown. Add a shebang.

Best Answer

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