https://code-reference.com/ 2026-05-18T17:33:33+02:00 https://code-reference.com/ https://code-reference.com/ttps://code-reference.com/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-02-16T01:04:04+02:00 https://code-reference.com/bash/how_to/run_command?rev=1708041844&do=diff bash: "How To" ... running commands operationwhatcodeexecutionresult of command executionRSLT=$?being rootif ($(id -u) -eq 0))execute command in variable “CMD” e.g. to programatically run same command either on localhost or via added ssh prefixCMD=“command parameter ...” eval $CMD work in progress text/html 2018-08-03T18:52:05+02:00 https://code-reference.com/bash/how_to/string_substitutions?rev=1533315125&do=diff bash: "How To" ... utilize string substitutions string parameter substitution operationwhatcodeexample using: export TST='abcabcaa'result from (abcabcaa)removefirst occurrence of substring 'xyz' in stringSTR=${STR/'xyz'}echo ${TST/'bc'}aabcaa (abcabcaa)substring 'xyz' everywhere in stringSTR=${STR//'xyz'}echo ${TST//'bc'}aaaa (abcabcaa)substring 'xyz' at very beginning of string (prefix)STR=${STR#'xyz'}echo ${TST#'abca'}bcaa (abcabcaa)substring 'xyz' at very end of string (suffix)STR=${STR… text/html 2018-08-03T05:58:24+02:00 https://code-reference.com/bash/how_to/tests?rev=1533268704&do=diff bash: "How To" ... utilize tests operationwhatcodestringvariable equal to “xyz“if [ $STR == “xyz” ]variable unequal to “xyz“if [ $STR != “xyz” ]variable contains substring “xyz“if [[ $STR =~ “xyz” ]]variable is in list “abc” or “def” (or ...)if [[ $STR =~ ^(“abc”|“def”)$ ]]integervariable equal to nif [ $STR -eq n ]file“node” exists (whatever type i.e. file, folder, ...)if [ -e “node” ]regular “filename” existsif [ -f “filename” ]create unique temporary filetouch /tmp/$$.tmpfind file “filename…