20.28 如何向awk脚本中传递外部变量
https://scz.617.cn/unix/201509231030.txt
A: scz 2015-09-23 10:30
有两种办法,一种是单引号,另一种是-v。
!/bin/bash
nawk="/bin/nawk" CURRENT_SHELL_PID=$(echo $$)
与awk脚本的输出形成对比
printf "%u\n" "${CURRENT_SHELL_PID}"
nawkcmd=' BEGIN \ { # # 为了引用外部变量,必须使用单引号,否则不会发生替换 # current_shell_pid = "'${CURRENT_SHELL_PID}'" printf( "%u\n", current_shell_pid ) } '
${nawk} "${nawkcmd}"
!/bin/bash
nawk="/bin/nawk" CURRENT_SHELL_PID=$(echo $$)
与awk脚本的输出形成对比
printf "%u\n" "${CURRENT_SHELL_PID}"
nawkcmd=' BEGIN \ { printf( "%u\n", current_shell_pid ) } '