Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- becki:linux:bash [2015-10-16 06:12]
becki [Bash Programming]
+++ becki:linux:bash [2016-03-03 11:25] (aktuell)
becki [File Inclusion, Command Execution]
@@ Zeile 16: / Zeile 16: @@
 **command**
-when the shell encounters a command, it forks off a child process to actually execute the command (external commands only; from abs-guide) FIXME: Is this true? Isn't this ''%%command &%%''?
+when the shell encounters a command, it forks off a child process to actually execute the command (external commands only; from abs-guide). Parent script blocks until child process ends
+**command &**
+forks off a child process to execute the command and put child process into background so that the parent script continues immediately
 **eval command ...**
@@ Zeile 23: / Zeile 27: @@
 For me useful if command contains spaces witch are protected by single quotes, eg ''%%wget -S --header'Content-Type: application/json'%%''. Without eval, ''%%--header'Content-Type:%%'' and ''%%application/json'%%'' would be interpreted as 2 single arguments
+===== Subshells ==
+FIXME
+===== Coprocesses ==
+The following example starts a shell function as a coproc and uses the coproc to manipulate a string:
+<code bash>
+#!/bin/bash
+test_coproc() {
+    read rein
+    echo ">$rein<"
+}
+coproc test_coproc
+echo "Hallo" >&${COPROC[1]}
+read -u ${COPROC[0]} rein
+echo "$rein"
+#cat <&${COPROC[0]} # alternative
+</code>
 ===== Expansion ==

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