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Linux基础101问:Linux中各种奇怪的符号|第7期下

  • 2026-01-29 18:09:57
Linux基础101问:Linux中各种奇怪的符号|第7期下

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七、通配符:(glob):*、?、[]

Shell 通配符用于模式匹配文件名。常见用法包括:
* 匹配任意数量的字符:
ls *.fastq.gz
?匹配单个字符:
ls sample?.bam
字符集匹配:
ls sample_[12].fastq.gz
在处理多样本数据时,通配符通常用于批处理脚本:
for f in *.fastq.gz; do     
    echo "Processing $f" 
done

八、分组命令:{ }

花括号可将一组命令作为整体进行重定向或逻辑控制。注意 {后需留空格:

{    
     echo "Header";    
     echo "Body";

} > out.txt

在生信处理中,可组合多个步骤的输出写入报告:
{     
     echo "Sample QC:";  
   fastqc sample.fastq.gz;

} > qc_report.txt

九、转义符:\

反斜杠用于移除字符的特殊含义。这在latex中也会用到很多,例如:

echo "Price is \$20"
也常用于处理包含特殊字符的路径或变量。

十、引号的作用:’ ‘与“ “

Shell 提供两种基本类型的引号。
单引号 ’  ‘ 会禁止变量替换:
echo '$HOME'
双引号" "会保留变量替换:

echo "$HOME"

可能会得到:/home/yourname,而不是“$HOME”这几个字符
在过滤表达式中常使用单引号以防止 Shell 提前解析比较符号:
bcftools view -i 'QUAL > 30'

十一、反斜杠换行符:\

当命令过长时,可使用反斜杠在视觉上分行:
bwa mem \
   -t 8 \
   ref.fa R1.fq R2.fq \
   > aln.sam

这种写法在运行 GATK 等长命令时非常常见。

十二、生信数据处理中的综合示例

下面展示一个由多个符号组成的完整命令:
zcat sample.fastq.gz \
   | fastp -i - -o clean.fastq \
   2> fastp.log \
   && echo "QC done" \
   &

该命令通过管道将解压的 FASTQ 直接传给 fastp,同时将错误输出写入日志。在 fastp 成功后输出提示信息,并将整个任务放入后台执行。


十三、综合练习题(含参考答案框架)

练习 1

目标是解压 FASTQ、过滤掉以 @H 开头的 header、统计剩余行数,并分别保存标准输出与错误输出。参考命令如下:
zcat reads.fastq.gz \
   | grep -v '^@H' \
   | wc -l > count.txt \

  2> err.txt

练习 2

对目录下所有 FASTQ 文件运行 FastQC,并将标准输出和错误输出记录到对应日志文件,同时所有任务需后台运行:
for f in *.fastq.gz; do
     fastqc "$f" >> stdout.log 2>> stderr.log &

done

练习 3

分析如下命令的作用:
(bcftools view -i 'DP>10 && QUAL>30' input.vcf || echo "filter failed") \
    > filtered.vcf 2> log.txt

该命令在子 Shell 中运行过滤操作;若过滤失败,则输出提示信息。随后将标准输出写入filtered.vcf,并将标准错误写入log.txt

下面的教程会频繁用到这些符号,特别是管道符,一定要好好看这两期的内容哦
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作者:刘鑫鹏(哥本哈根大学)
编辑:黎琛
排版:刘宇昂

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  1. CONNECT:[ UseTime:0.000518s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000612s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000288s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002284s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000492s ]
  6. SELECT * FROM `set` [ RunTime:0.000450s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000501s ]
  8. SELECT * FROM `article` WHERE `id` = 469087 LIMIT 1 [ RunTime:0.004145s ]
  9. UPDATE `article` SET `lasttime` = 1770472976 WHERE `id` = 469087 [ RunTime:0.007018s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.001095s ]
  11. SELECT * FROM `article` WHERE `id` < 469087 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000591s ]
  12. SELECT * FROM `article` WHERE `id` > 469087 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002317s ]
  13. SELECT * FROM `article` WHERE `id` < 469087 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.051751s ]
  14. SELECT * FROM `article` WHERE `id` < 469087 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.033401s ]
  15. SELECT * FROM `article` WHERE `id` < 469087 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004477s ]
0.175852s