awk
# awk
tee awk.txt <<-'EOF'
john wang male 30 02103213
ludc dasf fama 12 12311321
EOF
awk '{print $1,$4}' awk.txt
awk '{print NF}' awk.txt
# 打印最后一行 awk 默认以空位为分隔符 NF内部变量表示以分隔符划分后元素的个数
awk '{print $NF}' awk.txt
cat awk.txt | awk '{print substr($1,1)}'
cat awk.txt | awk '{print length}'
cat awk.txt | awk 'BEGIN{total=0}{total+=$4}END{print total}'
cat awk.txt | awk 'BEGIN{total=0}{total+=$4}END{print total/NR}'
sed
tee sed.txt <<-'EOF'
this is line 1, this is First line
this is line 2, the Second line, Empty line followed
this is line 4, this is Third line
this is line 5, this is Fifth line
EOF
# 替换
sed 's/this/That/g ; s/line/LINE/g' sed.txt
# 删除第一行
sed '1d' sed.txt
# 保存删除后文件
sed '1d' sed.txt > save_file
# 如果想直接修改源文件
sed -i '1d' save_file
# 删除指定范围 （第1-3行）
sed '1,3d' sed.txt
# 删除最后一行
sed '$d' sed.txt
# 清空文件
sed '1,$d' sed.txt
# 只保留第5行
sed '5!d' sed.txt
# 删除所有包含Empty的行
sed '/Empty/d' sed.txt
# 删除空行
sed '/^$/d' sed.txt
# 替换每一行的第一个值
sed 's/line/LINE' sed.txt
sed 's/line/LINE/2' sed.txt
sed 's/line/LINE/g' sed.txt
# 替换开头的this 为 that
sed 's/^this/that/'
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