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相关label的操作指令怎么用?最好举个实例来说明!(十三篇里的sed没有相关说明。)
: label
Label for b and t commands.
b label
Branch to label; if label is omitted, branch to end of script.
t label
If a s/// has done a successful substitution since the last
input line was read and since the last t or T command, then
branch to label; if label is omitted, branch to end of script.
T label
If no s/// has done a successful substitution since the last
input line was read and since the last t or T command, then
branch to label; if label is omitted, branch to end of script. |
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