use SHELL environment variable (thx Thomas Adam)
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			@ -208,9 +208,12 @@ die(const char *errstr, ...) {
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void
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execsh(void) {
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	char *args[3] = {SHELL, "-i", NULL};
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	char *shell = getenv("SHELL");
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	if(!shell)
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		shell = "/bin/sh";
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	char *args[3] = {shell, "-i", NULL};
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	putenv("TERM=" TNAME);
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	execvp(SHELL, args);
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	execvp(shell, args);
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}
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void
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			@ -844,7 +847,6 @@ tputtab(void) {
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void
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tputc(char c) {
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	/* dump(c); */
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	if(term.esc & ESC_START) {
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		if(term.esc & ESC_CSI) {
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			escseq.buf[escseq.len++] = c;
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