�转(Bash) ��Ʈ HOWTO: �ܺ� ��ɾ��

3.1 PROMPT_COMMAND

�转�� ٸ� ȯ�� PROMPT_COMMAND�� ˴ϴ�. �转�� Ʈ�� ǥ��ϱ� �ٷ� ��, �� 转 ��ɾ�μ�, �� ˴ϴ�.

[21:55:01][giles@nikola:~] PS1="[\u@\h:\w]\$ "
[giles@nikola:~] PROMPT_COMMAND="date +%H%M"
2155
[giles@nikola:~] d
bin   mail
2156
[giles@nikola:~]

�� Ͼ �� 帮�ڸ�, �̽�� '\t'�� Ѽ�, �� Ʈ�� ð�� ̻� ��Ե�� ʵ�� Ͽ��ϴ�. �׸�� 'date +%H%M' �� Ͽ� �� ϴ� �� ð�� ǥ��ϵ�� Ͽ��ϴ�. �׷�� ̹�� Ʈ�ʹ� �� ٸ� �ٿ� ��Ÿ��ϴ�. �转2.0+ �� 'echo -n ...'�� Ͽ� �� , �Ʒ�� ۿ��, �转1.14.7�� ۵�� ʰ� �˴ϴ�.: �� Ʈ�� ٸ� �� ۼ�� , �Ʒ�� ߺ�� Ÿ��ϴ�.

2156
[giles@nikola:~] PROMPT_COMMAND="echo -n [$(date +%H%M)]"
[2156][giles@nikola:~]$
[2156][giles@nikola:~]$ d
bin   mail
[2157][giles@nikola:~]$ unset PROMPT_COMMAND
[giles@nikola:~]

'echo -n ...'�� ¥ �� ǰ� �ڿ� �� '��' ��ڰ� ��ȿ ȭ�Ǿ�, ��Ʈ�� Բ� �� ٿ� ��Ÿ�� ˴ϴ�. ��, 'unset' �� ȯ�� PROMPT_COMMAND�� ŵǾ��ϴ�. ��ɾ� ��ġ�� $() �� Ϳ� ��Ͻʽÿ�: ��,

$(date +%H%M)

�� "��⿡�� 'date +%H%M' �� ġ�Ͻÿ�" �� ǹ� �Դϴ�. �̰�� 转2.0+ �� ۵��մϴ�. 1.14.7 �� 转 �� ο� ��ȣ(backquates)(`date +%H%M`)�� ʿ�� ϴ�. ��ο� ��ȣ�� 转2.0+ �� , $() �� ȣ �Կ� �� , $() �� ڸ�� ϴ�. �� Դϴ�. �� ϰ� ��ôٸ�, $() �� Ÿ�� ο� ��ȣ�� ġ�ϸ� �� Դϴ�. ��, ��ɾ� ��ġ�� ̽�� ó��Ǿ� �ִٸ� (��, \$(command) ), basckslash('\')�� Ͽ� �� ο� ��ȣ�� ̽�� ó�� Ͻʽÿ�(��, \'command\' ).

3.2 ��Ʈ�� ܺ� ��ɾ��

��Ʈ�� մϴ�. �ʹ� �� ͵�� Ʈ�� ϱ⸦ �� Դϴ�. �׷�� Ʈ�� ʹ� �� ״ϱ��. ��, �ż�� ó��Ǵ� ��ɾ ��ϱ⸦ �� Դϴ�. �ֳ��ϸ�, ��ũ�� Ʈ�� Ÿ�� ׸��ɾ�� Ǿ�� ϰ�, �۾�� ϴ� ��ȿ� ��Ʈ�� Ÿ�� ð� �� ֱ� ��Դϴ�.( �� , �转1.14.7�� ۵��մϴ�)

[21:58:33][giles@nikola:~]$ PS1="[\$(date +%H%M)][\u@\h:\w]\$ "
[2159][giles@nikola:~]$ ls
bin   mail
[2200][giles@nikola:~]$

��ɾ� ��ġ�� ޷��ȣ('$') �� backslash�� ϴ� �� ߿��մϴ�. �װ�� ܺ� ��ɾ�� Ȯ�ϰ� �ѹ�� ˴ϴ�: PS1 �� о� �鿩�� . �� Ʈ�� 쿡��, ��Ʈ�� ̰� �󸶳� �Ǵ�� ÿ� ǥ�õ� ��̶�� ǹ��մϴ�. backslash('\')�� $()�� ؼ�� ȣ�Ǿ�, "date" �� ο� ��Ʈ �� ˴ϴ�.

�� , date, grep, �Ǵ� wc �� ׸�� ƿ��Ƽ ��α׷�� μ��Ǿ� �־�, ��Ÿ�� ó�� ֵ�� մϴ�. ��, �̵� ��α׷�� ؼ� ��Ʈ �ȿ� �ְ�� Ͻ� �ٸ�, �� ڽ�� ũ��Ʈ�� ۼ�� , ��Ʈ�� װ�� ҷ� ��̴� �� ϴ�. �� Ǯ�� ϱ� �� ũ��Ʈ �� ̽�� 䱸�˴ϴ�(�� ¥ ��ɾ�� ): �̰�� Ʈ PS1 �� ܰ� �� ö� �� ̸�, �� ũ��Ʈ�� Ͽ� ȸ��ϴ� �� Ǹ�� ̵��Դϴ�.

��Ʈ �� Ǵ� ��׸� �� ũ��Ʈ �� Ʒ�� ־��ϴ�.

#!/bin/bash
#     lsbytesum - sum the number of bytes in a directory listing
TotalBytes=0
for Bytes in $(ls -l | grep "^-" | cut -c30-41)
do
    let TotalBytes=$TotalBytes+$Bytes
done
TotalMeg=$(echo -e "scale=3 \n$TotalBytes/1048576 \nquit" | bc)
echo -n "$TotalMeg"

�� ̰�� Լ��(�ξ� ȿ��-��ϰԵ� �Լ�� ڼ�� Դϴ�), �Ǵ� ��ο� ��ԵǾ� �ִ� ' /bin' ��丮�� ִ� �� ũ��Ʈ�� ϴ�. ��Ʈ�� Ǿ� �Ʒ�� ˴ϴ�.

[2158][giles@nikola:~]$ PS1="[\u@\h:\w (\$(lsbytesum) Mb)]\$ "
[giles@nikola:~ (0 Mb)]$ cd /bin
[giles@nikola:/bin (4.498 Mb)]$

3.3 ��Ʈ�� ʿ�� ׹�� ͵�

��κ�� Ʈ�� ð�� 丮�� ̸�� ԵǾ� �ִٴ� �� ϴ�. ��⿡�ٰ�, �� ȿ�� Dan�� Ʈ�� ְ�� մϴ�.

[giles@nikola:~]$ cur_tty=$(tty | sed -e "s/.*tty\(.*\)/\1/")
[giles@nikola:~]$ echo $cur_tty
p4
[giles@nikola:~]$ PS1="\!,$cur_tty,\$?\$ "
1095,p4,0$

��丮 ��θ� �ٲ޿� �� Ʈ�� ũ�Ⱑ ��۽�� ٲ� �� ֱ� �� Dan�� Ʈ�� 丮�� ǥ�õǴ� �� ϴ�. �׷�� ״� ��丮�� 븦 �� Ӹ��ӿ� ��մϴ�(�Ǵ� "pwd"�� ġ�⵵ �մϴ�.) Dan�� cash�� tcsh�� н�� , �״� ��ɾ� history�� ϰ� ��ϰ� ��(�츮�� κ�� 转�� ٰ� �ϱ⿡ �׷� �ʿ䰡 ��), �׷��, �� Ʈ�� ù��° �׸�� ɾ� history ��ȣ�Դϴ�. �ι�° �׸�� tty�� ߿� ��ڵ� �Դϴ�("tty"�� 'sed'�� ϴ�). ��° �� command/pipeline�� exit ��Դϴ�(note that this is rendered useless by any command executed within the prompt - you could work around that by capturing it to a variable and playing it back, though). ��, "\$"�� Ϲ� ��ڿ��Դ� �޷� ��ȣ�� Ÿ��, ��ڰ� ��Ʈ�� 쿡�� ؽ� ǥ��("#") �� Ÿ��ϴ�.

3.4 �转 ȯ�� Լ��

�տ�� ޵� �ٿ� ��, PS1, PS2, PS3, PS4 �׸�� PROMPT_COMMAND �� 转 ȯ�� Ǿ� ��ϴ�. DOS�� ͼ�� е�� ū ���� ȯ�� ѱ�µ�� Ͽ� �η�� Դϴ�. �ֳ��ϸ� DOS�� ȯ�� ׸�� , �� Ȯ�� ʾұ� ��Դϴ�. ȯ�濡 �� ְ� �־�߸� �ϴ� �͵鿡 ��ؼ� �� , �װ͵�� 𸣰�, ��⿡�� DOS ��ڵ鿡�� ͼ�� ׷� ȯ�溸�ٴ� �Ը� �־ �Ƹ� ��質 �ξ� �� ū �Ϳ� ��Ͽ� �̾߱⸦ �ϰ� ��ϴ�. �츮�� Dan�� մϴ�:

"�� ϴ� ��, 62�� ˸��ƽ�� 25�� Լ�� ϴ�. ��迡�� 쿡, � �� ܵ�� ʿ��ϰ� bash�� , �װ�� Լ�� ٴ� �� ù��° ��Ģ�Դϴ�(�˸��ƽ�� ǥ�� ٴ� ��Ͽ��). �� ޸𸮿� ��ؼ� ��ϴ� �� ִٸ�, �׵�� bash�� ʿ䰡 ��ϴ�. Bash�� 迡�� Ǵ� �� ū ��α׷� �� ϳ��Դϴ�(Oracle�� ϰ�). �� 'top'�� Ѽ� �� ޸𸮺�� з��ϱ� �� 'M'�� -��Ͽ�� bash�� 󸶳� ��ʿ� �� ִ�� . ��, sendmail��ٵ� �� ġ�� ũ��! �׵� �� ash�� Ǵ� �ٸ� �͵�� ϶�� ϼ��"

�Ƹ�� ״� �� ۾�� Ϸ�� ϴ� �� ܼ�� ʳ� ��մϴ�:X�� X�� α׷�� Ű��, �转�� ū �͵�� ϴ�. �׷��, ��̵�� մϴ�:ȯ��̶�� Ǿ�� ϴ� ��̰�, �װ�� ġ�� ʿ䰡 ��ϴ�.

�� ̷�� (�ʹ� �ܼ�ȭ ��״ٴ� �Ϳ� ��ؼ�) ��н� �� å�� , �Լ��̶� �⺻�� ȿ�� ȯ�� Ǵ� ��׸� �� ũ��Ʈ��Դϴ�. Dan�� ٽ� �ο��մϴ�:"�� Լ�� ŭ ȿ��ȭ �Ѱ��Դϴ�. It is the approximate equivalent of sourcing a bash/bourne shell script save that no file I/O need be done as the function is already in memory. �� Լ�� , �װ͵�� ʿ�� Ǵ� �Ϻ�� 䱸�Ǵ°�� , [.bashrc �Ǵ� .bash_profile]�� ˴ϴ�. �� ũ��Ʈ �ϳ�� Ѽ� �̰�� ʽÿ�: �� б��Ͽ�, �ڽ� ��ν꽺�� exec �� ϰ�, potentially ��ΰ� ã��, Ŀ�� �� ϱ�� Ʈ�� ˻��ϸ�, �� ũ��Ʈ�� ũ��Ʈ�� ̸�� Ͽ� ��Ͽ�� ϸ�, �� , �а� �� մϴ�. �� Լ�� Ͽ�, �� ϴ� �� ٸ� �͵�� ʿ�� ֵ˴ϴ�."

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3. �ܺ� ���ɾ��

3.1 PROMPT_COMMAND

3.2 ������Ʈ������ �ܺ� ���ɾ��

3.3 ������Ʈ���� �ʿ��� �׹��� �͵�

3.4 �转 ȯ��� �Լ���

3. �ܺ� ��ɾ��

3.2 ��Ʈ�� ܺ� ��ɾ��

3.3 ��Ʈ�� ʿ�� ׹�� ͵�

3.4 �转 ȯ�� Լ��