Linux文本处理
多行连接
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> for e in `seq 1 7`; do echo $e; done
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7
使用sed正序连接
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> for e in `seq 1 7`; do echo $e; done | sed -n '1h;1!H;1!g;$!d; s/\n/,/g; p'
1,2,3,4,5,6,7
或者
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> for e in `seq 1 7`; do echo $e; done | sed ':a;N;$!ba;s/\n/,/g'
1,2,3,4,5,6,7
使用sed逆序连接
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> for e in `seq 1 7`; do echo $e; done | sed '1!G;h;$!d; s/\n/,/g'
7,6,5,4,3,2,1
使用tr正序连接
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> for e in `seq 1 7`; do echo $e; done | tr -s '\n' ',' | sed 's/,$//'
1,2,3,4,5,6,7
使用tr逆序连接
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> for e in `seq 1 7`; do echo $e; done | tr -s '\n' ',' | sed 's/,$//' | rev
7,6,5,4,3,2,1
使用awk正序连接
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> for e in `seq 1 7`; do echo $e; done | awk 'ORS=","' | sed 's/,$//'
1,2,3,4,5,6,7
使用awk逆序连接
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> for e in `seq 1 7`; do echo $e; done | awk 'ORS=","' | sed 's/,$//' | rev
7,6,5,4,3,2,1