I think this is what you want: A=3; ssh host@name “B=3; echo $A; echo \$B;” When you use double-quotes: Your shell does auto expansion on variables prefixed with $, so in your first example, when it sees ssh host@name “B=3; echo $A; echo $B;” bash expands it to: ssh host@name “B=3; echo 3; echo ;” … Read more
Arrays are useful to keep your parameters whole: command=(su aUser -s /bin/bash -c ‘echo A’) and invoke it exactly like this: “${command[@]}”
One reason can be remembed locations. You can clear the cached locations by issuing following command: hash -r SIDENOTE: Instead of which, using type command, you can see the hashed location: $ type pip pip is /usr/local/bin/pip $ pip -V pip 1.5.6 from /usr/local/lib/python2.7/dist-packages (python 2.7) $ type pip pip is hashed (/usr/local/bin/pip)
A slight improvement to my comment: if your script exits with true (e.g. when it ends with exit 0), you can run while script; do sleep 10; done This is the canonical way to repeat a command as long as it doesn’t fail.
Just use single quotes: export VAR2=’d#r3_P{os-!kblg1$we3d4xhshq7=mf$@6@3l^’
Let’s take things step by step: When you do this: mycmd=’cat $myfile’ You prevent the shell from interpolating $myfile. Thus: $ echo $mycmd cat $myfile If you want to allow the interpolation, you can use double quotes: $ mycmd=”echo $myfile” #Double quotes! $ echo “$mycmd” cat afile.txt This, of course, freezes the interpretation of $mycmd … Read more
You variable contains a carriage return. Try saying: cd $(echo $RED_INSTANCE_NAME | tr -d ‘\r’) and it should work. In order to remove the CR from the variable you can say: RED_INSTANCE_NAME=$(echo $RED_INSTANCE_NAME | tr -d ‘\r’) The following would illustrate the issue: $ mkdir abc $ foo=abc$’\r’ $ echo “${foo}” abc $ cd “${foo}” … Read more
Have a look at colormake, found here $ apt-cache search colormake colormake – simple wrapper around make to colorize output Using the power of google, I also found this bash-function. make() { pathpat=”(/[^/]*)+:[0-9]+” ccred=$(echo -e “\033[0;31m”) ccyellow=$(echo -e “\033[0;33m”) ccend=$(echo -e “\033[0m”) /usr/bin/make “$@” 2>&1 | sed -E -e “/[Ee]rror[: ]/ s%$pathpat%$ccred&$ccend%g” -e “/[Ww]arning[: ]/ … Read more
You can also make it with help of Homebrew – which is quite nice and popular package manager To Install homeBrew past in your terminal ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)” To install imagemagick past in the terminal brew install imagemagick
#!/bin/bash /usr/local/bin/mongo-connector \ -m “$MONGO_HOST” \ -t “$NEO_URI” \ ${VERBOSE:+-v} \ -stdout If VERBOSE is set and non-empty, then ${VERBOSE:+-v} evaluates to -v. If VERBOSE is unset or empty, it evaluates to the empty string. Note that this is an instance where you must avoid using double quotes. If you write: cmd “${VERBOSE:+-v}” rather than … Read more