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Append the data to first column

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# 1  
Old 06-02-2009
Append the data to first column
Hi,

The below is the content of the file.

008.03.50.21|ID4|0015a3f01cf3
008.04.20.16|ID3|0015a3f02337
008.04.20.17|ID4_1xVoice|00131180d80e
008.04.20.03|ID3_1xVoice|0015a3694125
008.04.30.05|ID3_1xVoice|0015a3f038af
008.06.30.17|ID3_1xVoice|00159660d454
009.05.70.04|ID3_1xVoice|0015a3ea814b
009.05.70.12|ID3_1xVoice|0015a36922f9
013.01.50.09|Service|0015a2d82070

I need to append "_1" to the first column only. The output should look like

008.03.50.21_1|ID4|0015a3f01cf3
008.04.20.16_1|ID3|0015a3f02337
008.04.20.17_1|ID4_1xVoice|00131180d80e
008.04.20.03_1|ID3_1xVoice|0015a3694125
008.04.30.05_1|ID3_1xVoice|0015a3f038af
008.06.30.17_1|ID3_1xVoice|00159660d454
009.05.70.04_1|ID3_1xVoice|0015a3ea814b
009.05.70.12_1|ID3_1xVoice|0015a36922f9
013.01.50.09_1|Service|0015a2d82070

please help me in writing regular expression in unix.

Thanks in advance for helping in solving the above issue.
# 2  
Old 06-02-2009
What you have tried so far?
# 3  
Old 06-02-2009

Use awk -F\| and append "_1" to $1.
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